/chem/ Chemistry general

[Anonymous No.12232374]

[Anonymous No.12232401]

>>12232374
Im de one da canocks the door B-) you godammed righted

[Anonymous No.12232905]

>>12232374
How come the content in chemistry labs don't correlate with what you're learning in class?

[Anonymous No.12232919]

>>12232374
do you need a 1000IQ to study chemistry? i aced my physics math and EE classes no problem but chemistry always fucked with my head so much

[Anonymous No.12232966]

>>12232919
What exactly do you have a problem with?
I know of some smart people who have problems when it comes to visualizing molecules and rotating them in your head because they can't manipulate 3d objects in their heads.

[Anonymous No.12232986]

How do I make HF without dying or using glass?

[Anonymous No.12233005]

>>12232966
The rules always seemed so complicated, I never understood why certain molecules were bonded the way that they were or how the orbitals worked. I took quantum at uni where we learned about the orbitals but it didn’t make sense to me there either. I swear I’m not retarded, but chemistry just never sat right in my brain

[Anonymous No.12233079]

>>12233005
>>>12232966
>The rules always seemed so complicated, I never understood why certain molecules were bonded the way that they were or how the orbitals worked. I took quantum at uni where we learned about the orbitals but it didn’t make sense to me there either. I swear I’m not retarded, but chemistry just never sat right in my brain

Well if you took quantum and didn't make sense of it then it might be temporarily hopeless


Did the material NOT make sense or did you think the teacher was not good

[Anonymous No.12233091]

>>12232986

NaF + H2SO4 in teflon. Distill. Or just mix NaF with any strong acid in water. Then you have HF solution.

[Anonymous No.12233099]

>>12232966
It takes two years of chemistry plus some physics to even be a beginner. It takes a while to learn all the rules.

[Anonymous No.12233131]

>>12233005
Think of positive/negative charges like magnets where you have a a positive and negative end of a magnet.
The electrons fill orbitals to become whole so certain atoms will bind together to compliment each other.
There are definitely a lot of variables the deeper you go. The thing with chemistry is that you're constantly building your base of knowledge. I'm majoring in chemistry because I just think that the interactions between matter at that scale speaks some sort of fundamental truth about reality.
That's funny about physics, though. I find physics really boring and just get enough points to pass. It contradicts my point about the philosophical aspect of chemistry that intrigues me, but for whatever reason physics is just really boring to me.

[Anonymous No.12233146]

>>12233131
>Think of positive/negative charges like magnets where you have a a positive and negative end of a magnet.
>The electrons fill orbitals to become whole so certain atoms will bind together to compliment each other.
Is it your first semester, the dude said he took quantum mechanics, you will be asking yourself "what the fuck is an electron?" every other week in organic.

[Anonymous No.12233155]

>>12233146
I have an A in orgo I so far this semester.
take my posts here as no allusion to me being some kinda big brain nibba. I've got a comfy R&D job lined up b/c of nepotism and all I need is my bachelors.

[Anonymous No.12233170]

>>12233005
>or how the orbitals worked.
>I took quantum
the way chemists think of orbitals, esp. bonding and hybridization, is a top-down view of a half-truth. It's a simple 3d puzzle/game that, for most purposes, is good enough.
The way quantum physicists study orbitals is technically more correct, but almost entirely useless for practical work.

[Anonymous No.12234353]

>>12233079
Like the equations all balanced and I could answer the questions correctly, but I never had any idea what it really meant. This was a few years ago so honestly I’ve forgotten most of what we learned anyway bc I’ve never used quantum for anything

[Anonymous No.12234443]

>>12232374
I'm supposed to do the annual legally required safety training and I want keep people from falling asleep during the lecture

Anyone has some cool, (ideally) documented horror stories to scare the shit out of people so that they won't blow up the lab?
Things like Seveso explosion, Bradfod arsenic flavored humbugs, Karen Wetterhahn poisoning etc.
pic related, don't mix alcohol and nitric acid

[Anonymous No.12234447]

im starting my bachelors in chemistry next year. taking a gap year rn
would you guys recommend also doing a masters? im in europe

[Anonymous No.12234668]

>>12234447
I'm in the same boat man

[Anonymous No.12234687]

>>12232374
>capric acid
>nonanoic acid
imagine the smell

[Anonymous No.12234692]

>>12232905
it's almost impossible to theoretically fully model what happens in most labs. Too many parameters.

[Anonymous No.12234705]

>>12232986
buy fluorite mineral from alibaba
put in teflon vessel with exit teflon tube
add concentrated H2SO4
distill at near-room temperature
collect in teflon bottle

[Anonymous No.12234709]

>>12234443
the Bhopal accident in India

[Anonymous No.12234741]

>>12234443
>, don't mix alcohol and nitric acid
Why not?!

[Anonymous No.12234799]

Physical chemistry is just physics, right?

[Anonymous No.12235093]

I like chemistry. I wish I would've done it instead of computer science.
I don't have anything to add, I just wanted to bump the thread since I like reading the rare chem threads on here.
Pic related is my favorite molecule. I don't use it or anything(not even therapeutically), I just love the way it looks for some reason.

[Anonymous No.12235171]

>>12235093

[Anonymous No.12235185]

dump your fav chemistry girls

[Anonymous No.12235274]

>>12235171
Based and Prussian Bluepilled

[Anonymous No.12235341]

>>12232919
Nope. Chem is pretty diverse once you pass the intro classes so it's easy to find something you're good at that's also interesting
t. C+ in organic, A in analytical/physical

[Anonymous No.12235369]

>>12234443
A woman burned to death in a UCLA lab in 2000-something when she spilled a tert-butyl lithium syringe on herself. Not only was she working alone, but the people that found her on fire didn't know English and/or the proper firefighting procedures. Just look up t-butyl lithium lab death, it's a pretty well documented case.

[Anonymous No.12235385]

>>12234447
Postgrad degrees are pretty important for chem, especially if you want a more advanced position in industry. That said, the average salary for a chem masters is falling, while the salaries for PhD and BS are staying roughly the same. Degree inflation comes for us all.

[Anonymous No.12235646]

>>12234741
>alcohol gets nitrated
>nitrated compounds explode
a part of a brewery in Denmark blow up when some guy cleaned tank with 15% alcohol, mixed up the valves and added concentrated nitric acid
make you don't mix up the waste organics and waste acid jugs

[Anonymous No.12235650]

>>12235646
*make sure

[Anonymous No.12235698]

>>12235369
>Not only was she working alone
IIRC there was a post-doc supervising her and he didn't know what the fuck he was doing b/c his background was computational.

[Anonymous No.12235723]

>>12235698
How can someone be so incompetent that they don't know to put someone on fire under the giant cartoon fucking SHOWER in the classroom?
>Hold on guys, t-butyllithium is a strong base. Throw some baking soda on her!

[Anonymous No.12235746]

>>12235723
I'm not well versed in the immediate aftermath, that was someone else's post.
The problems they had that led to the fire was lack of proper technique given the scale and reactivity (they used a 1.5 in needle and had to invert the reagent bottle which is a huge fucking mistake here) and lack of proper ppe (she didn't even wear a lab coat and a synthetic fiber sweater melted into her skin.)

[Anonymous No.12235753]

>>12235723
cont.
a few details here
https://cen.acs.org/safety/lab-safety/10-years-Sheri-Sangjis-death/97/i1
unfortunately I cannot easily find the most informative C&ENews article on this b/c there are so many items returned in the google search.

[Anonymous No.12235875]

>>12232374
Coordination chemistry, discuss.

[Anonymous No.12235893]

>>12232919
Filtered midwit. I assume you have problems with the trinity too? Funny how any advance concept that relies on at times paradoxical knowledge sends smooth brains like you into a frenzy and literal cope. You aren't going to make it. You're better off just accepting you're not cut out for anything involving the sciences or intellectual pursuits.

[Anonymous No.12235904]

Organic chemistry is the only fun science.
In organic chemistry you get to mix together chemicals like a mad scientist, use badass glassware like in breaking bad, use cool chemicals in bottles with big long names, make stuff, make smells, make medicines, make plastics, do all kinds of cool chemical reactions, etc. All fun, no boring math.

[Anonymous No.12235924]

>>12235904
True I like organic synthesis very much apart from column chromatography.

[Anonymous No.12235935]

>>12235646
>Nitrate ester
> A well-known example is nitroglycerin
Jesus Christ man

[Anonymous No.12235945]

>>12235904
fun fact:
Walter White studied at the California Institute of Technology (Caltech) with his best friend Elliott Schwartz, where he proved himself a brilliant chemist with a specialty in X-ray crystallography.

[Anonymous No.12235976]

>>12235904
Inorganic chemistry is the only fun science.
Your products are anything from coloured crystals to amalgums to the deadliest of liquids. Everything gives you cancer, and you dont give a shit. You do it wrong you end up with black boiling goo, not the wrong clear liquid. Superconductors, magnets, optical devices, its all inorganic chemistry- you use the whole periodic table, not just 8 of the elements.

[Anonymous No.12235981]

>>12235875
Best part, especially their spectra

[Anonymous No.12235988]

>>12235893
Okie dokie senpai

[Anonymous No.12235990]

>>12235893
Why did you chimp out?!

[Anonymous No.12236000]

Allow me to introduce you to liquid death.

[Anonymous No.12236027]

>>12235723
Dont know the details but I think commonly its bc people are scared.

If someone is on fire and panicking you have to punch them/ get control. People nowerdays lack the confidence to do this...so someone is flailing around on fire/ or blind/ or cant breath... no health and safety program prepares you for someone going full chimp survival mode.

I recommend every person pursuing serious chemistry learn how their safety equipment works (how many people have never tried to use the eye wash stations, or turned on the industrial showers? How do you expect to use them in an emergency? - hint - everything gets fucking soaked)

because of chemo-phobia lots of bad accidents are avoided (good) but when they do happen no one really knows what to do (bad)

[Anonymous No.12236059]

>>12236027
>If someone is on fire and panicking you have to punch them/ get control.
not really a smart move
you might get sued, or even go to jail because your punch killed the person

[Anonymous No.12236067]

>>12236059
this is the attitude im talking about. right here. 'oh but i might get sued, oh they're dead, nevermind'

[Anonymous No.12236094]

>>12236067
It's not a "either punch her or she'll die" kind of a situation
There has to be a more practical way to deal with it

[Anonymous No.12236103]

>>12236094
I think your emphasising 'punch' to much (which is why i said 'get control'). My point is to save someones life you have to get control of them if they are panicking. Not that you should just punch people in an emergency? I dont see how thats hard to comprehend.

[Anonymous No.12236125]

>>12236103
of course I'm talking about "punch"
I completely agree with having full control over the victim's body, that's what lifeguards do when they try to save a person who's drowning, they lock his hands so he won't bother them when they're taking him out of water
The question is how you do that to a person who's on fire

[Anonymous No.12236134]

>>12236027
I have a controversial opinion that for nontoxic, acid/base chemistry only one glove is ideal for safety.
One hand to do stuff that you know you might get a little bit of solution or whatever on your hand, the bare hand for doing mindless mechanical stuff like titrating etc.
If I get a corrosive chemical on me I want to know right when I do. I swear I must have get miniscule amounts of high concentration acid/base on my gloves without realizing it, and then through however many points of contact it ends up in my eye when I fidget with my goggles and I feel a very minor sting.

I think everyone should have to get a minor burn in chem 101 so they actually know what they're working with. It's not that bad desu

[Anonymous No.12236141]

>>12236125
You will get burnt in the process, no way around it.

[Anonymous No.12236157]

>>12236134
I think they overdo the 'gloves' especially in undergrad. And yes a small chemical burn is good to have, its the point about knowing what to do. Gloves imo just mean people ignore spills/ splashes/ drops and just spread them around and have (generally) less control of their equipment.

I think a funny one is potassium permanganate- they treat it like liquid death in some places. I actually have to use it as a medication and soak my hand in a solution of the stuff for 20 fucking minutes so i guess that was all bs.

[Anonymous No.12236202]

Guys I'm making a Gilman reagent for a Corey-House type reaction. One synthon is iodopentadecane and the other is 18-iodooctadecanoic acid methyl ester, i.e. I'm making a 33 carbon fatty acid methyl ester.

I cannot for the life of me get it them to couple. My last attempt resulted in a fucking secondary alcohol for some fucking reason

First, I use 2.2 equ tBuLi to prepare a a 15 carbon primary alkyl lithium. I then transfer the alkyl lithium to a suspension of purified 0.5 eq copper (I) iodide in ether to make the Gilman reagent. I then add my methyl ester to the Gilman reagent. I've failed at all my attempts. Anyone got any tips? My solvents are all freshly distilled from molecular sieves and degassed by 3 fpt cycles. I keep everything under nitrogen, use cannula transfers, everything is clean and tidy. Wtf am I doing wrong? Should I make the Gilman reagent with the methyl ester instead?

[Anonymous No.12236267]

>>12236202
>Corey-House type reaction

[Anonymous No.12236388]

>>12236267
Kek I never made that connection, thanks anon

[Anonymous No.12236943]

>>12236388
I'm glad I could help
Hopefully the humor that now warms your soul will guide you to the proper chemical cacophony that rectifies your predicament.

[Anonymous No.12238196]

>>12236000
checked
all hail nickel tetracarbonyl

[Anonymous No.12238295]

I've got to do a manual column for the first time since forever next week as the flash column is busted, I've gotten too used to flash column chromatography and haven't done a proper manual one since undergrad
Any handy tips anons?

[Anonymous No.12238302]

>>12238295
I meant automated FCC btw in that post

[Anonymous No.12238672]

>yes i eyeball everything, how could you tell?
>failed results? just blame the equipment or round it off
>group work? i just browse 4chan or play gacha while the rest work
>concentration? mol? i am not a math nerd just put three

[Anonymous No.12238815]

>>12238672
Don't forget
>smelling every chemical
>taste testing every chemical
>working butt naked "for comfort"
>groping the freshmen twinks that are doing babby's first titrations

[Anonymous No.12239083]

What kind of lab coat would you recommend for a beginner? I’m getting one (after having borrowed it from my brother for months) that is 65% polyester and 35% cotton, it says it’s anti-acid with anti-panic buttons and elastic cuffs, from amazon, does this sound good? I’m going to use it for some chemistry classes at uni

[Anonymous No.12239185]

>>12238672
>Sources of error: human error

[Anonymous No.12239300]

>>12239083
100% cotton, always
worst case scenario, your coat will soak up a bit of acid and develop a few holes overnight

plastic fiber labcoat is extremely dumb idea and whoever came up with it should be waterboarded with ammonia solution
it will melt if you heat it up or spill some solvent on you while acid will safely drain away onto your pants and into your shoes

elastic cuff is a good idea
another important bit - your sleeves shouldn't be too loose or else you will catch on a flask and spill it over

[Anonymous No.12239399]

>>12238672
>reuse gloves because whatever was on them evaporates in your lab coat pocket by the next day
>fume hoods are for cucks, if I'm smelling aminated organic solvents, so is everyone else
>take concentrated solvents home and never buy cleaning products ever again

[Anonymous No.12239693]

>>12239083
>>12239300
It's weird how most lab coats I see for sale are the 65:35 ratio you mentioned. I guess they're just for looks anyway

Get a chem apron and mog all your pussy classmates

[Anonymous No.12239806]

>>12236000
I don't like this.

[Anonymous No.12240316]

I have a really badly clogged sink /sci/
I think it is from hair from shaving into it.
Whenever I pour drain-o down it, it will drain the liquid. But then if I run the sink it will clog again.
Can I get some lye ([math] NaOH[/math] salt and dump it down the drain?

[Anonymous No.12240416]

>>12239083
don't need one. cotton shirt you can tear off is enough

[Anonymous No.12240651]

Is ethanol capable of removing oxide coating from aluminum?

[Anonymous No.12240656]

>>12234443
>>12234741
https://en.wikipedia.org/wiki/Nital
Depends on the alcohol, but the reaction is explosive with ethanol.

[Anonymous No.12240786]

>>12238815
>Why yes, I inject every chemical into my vein to study its effects on human body

[Anonymous No.12240813]

>>12240786
This but unironically
Chemists used to be big dick men and do shit like test their own new drug creations.

[Anonymous No.12240848]

>>12240316
Drain-o and lye are both sodium hydroxide. Get an enzymatic cleaner to chop up all those hairs

[Anonymous No.12241593]

>>12240651
fuck no
>>12240813
>ywn discover the gold standard of psychedelia due to lax standards in a stomach med lab
just km now

[Anonymous No.12241608]

>>12232374
Are there well-paying positions for this field? It's the only thing keeping me from it.

[Anonymous No.12241619]

>>12241608
>Anonymous 10/17/20(Sat)04:46:12 No.1224160
I'm NEET so I'd accept $30k QC desu

[Anonymous No.12241622]

>>12241619
I'm an only child. I can't afford to just choose to major in a field with such low pay. I can't find any positions that make more than $40k.

[Anonymous No.12241685]

>doing physchem labwork
>we had to heat a solution to 50 degrees
>3 girls standing around the hot plate
>scared to take the beaker off
>they talk about using crucible tongs to get it
>just reach to grab it myself because it's 50 fucking degrees
>"NOO ANON YOU'LL BURN YOUR HAND!!"

[Anonymous No.12241686]

>>12241685
...Celsius?

[Anonymous No.12241688]

>>12241686
Yes.

[Anonymous No.12241895]

>>12239083
>I’m going to use it for some chemistry classes at uni
doesn't your uni supply lab coats?

[Anonymous No.12241901]

>>12241685
they'll never make it, a chemist shouldn't be afraid to get burns.
Bet they throw a shit fit when you sniff your rbf to make sure the solvent has all evaporated too.

[Anonymous No.12241992]

>>12241901
It's not "Checking to see if the solvent evaporated" when you do it for the 5th time and sniff for a minute sustained, anon.

[Anonymous No.12242031]

>>12241992
>he doesn't take a nipper of ether every few minutes to make the distillation go faster.

[Anonymous No.12242137]

>>12241593
So how does ethanol corrode aluminum engines?

[Anonymous No.12242446]

>>12241992
I have to be sure

[Anonymous No.12242527]

>>12239300
>>12239693
Thank you! Just got a 100% cotton one.

>>12241895
Not anymore because of covid

[Anonymous No.12243088]

>>12240848
like what?

[Anonymous No.12243107]

>>12242137
the engine is hot right, and other shit is burning inside (unless you're talking 100% ethanol fuel).
that's not like soaking aluminum in ethanol at rt.

[Anonymous No.12243112]

>>12243088
https://www.amazon.com/AmazonCommercial-Multi-Purpose-Enzyme-Cleaner-1-Gallon/dp/B07XL3C6FR/ref=sr_1_5?dchild=1&keywords=enzyme+drain+cleaner&qid=1602972278&sr=8-5
of course amazon has a bunch of other similar products as well

[Anonymous No.12243171]

>>12243112
thanks

[Anonymous No.12243197]

>>12234443
https://public.paratext.com/customer/blog/article.php?id=210&type=research

[Anonymous No.12243734]

>>12243107
Yeah, but the aluminum engine still has it's oxide coating, does it not?

[Anonymous No.12244862]

[Anonymous No.12244874]

>>12233155
then why are you trying to explain something that other people understand much better than you? you shouldn't talk about highly technical subjects when you haven't the first of their fundamental underpinnings nor the motivation for why they are taught the way they are. retarded nigger

[Anonymous No.12245117]

>>12235904
you posted the same idiocy on reddit

[Anonymous No.12245760]

>>12234443
At Loughborough a THF still caught fire, the guy put it out but it reignited. He phoned the fire brigade, but they could not hear him over the sound of the alarms, so he left the lab to phone as he was working by himself. While he was away it reignited and burned the lab down. This was 24-25 years ago.

[Anonymous No.12245838]

>>12235924
I enjoyed running columns when i was working on my papers.
Brainlet labmates beeded 3h to isolate the product, i did it in 30 mins and got perfect nmr spectra for several different molecules we worked with
Idiots didnt see that fucking selenium compounds made it all yellow or brown-ish, kept using 150 flasks and hogged the rotovaps for hours


Teacher was a cunt tho, dumped 15 different projects on each of us and complained that we never got any of them finished.

[Anonymous No.12246162]

Battery.

Add catalyst and it breaks down at room temperature back to complex battery is formed from, or complex gets broken down by catalyst at room temperature.

[Anonymous No.12246324]

>>12234443
do a demonstration with some trimethylaluminum

[Anonymous No.12247840]

[Anonymous No.12247855]

>>12234353
>Like the equations all balanced and I could answer the questions correctly, but I never had any idea what it really meant.
university in a nutshell

[Anonymous No.12248635]

I hate boron so fucking much.

[Anonymous No.12248701]

just fucked up my chemistry exam
will get a B at best
fuck this shit man

[Anonymous No.12248704]

>>12234443
i downloaded this picture from my annual safety training bullshit. it always makes me chuckle

[Anonymous No.12248722]

>>12248704
this is basically how I run things
except labcoat and glasses
they only slow me down

[Anonymous No.12248828]

>>12248635
Fuck you faggot

[Anonymous No.12249009]

>>12238295
whats the CV?

[Anonymous No.12249014]

>>12232905
Because you're in gen chem. Idk if its just me, but I never know what the fuck im doing in lab until I write the report anyway.

[Anonymous No.12249112]

>>12241685
>>"NOO ANON YOU'LL BURN YOUR HAND!!"
they wanted to fuck, trust me.

desu i wash hands in 50 degree water

[Anonymous No.12250042]

Why do I need to take two semesters of introductory physics if I want a BS in chemistry

[Anonymous No.12250045]

>>12244874
I just trying to help

[Anonymous No.12250061]

>>12250042
You need to study quantum physics to understand chemistry, and you need to be comfortable with ordinary physics before you make the jump to quantum!

[Anonymous No.12250092]

>>12250061
>You need to study quantum physics to understand chemistry
that's where you're wrong, kiddo

[Anonymous No.12250170]

>>12244874
I know not all chemists are gatekeeper ASD types, but why are all the gatekeeping aspies in chemistry?

[Anonymous No.12250768]

>>12250042
Certain topics in E+M are relevant in chem, especially if you're going into the physical/analytical direction

[Anonymous No.12251290]

>>12250042
Because the university system thinks ignorance can be cured without the interest to cure it.

[Anonymous No.12251305]

Do methyl ions and hydroxymethyl ions exist? Can they corrode metals?

[Anonymous No.12251643]

>>12247840
the Players Ball, if you will

[Anonymous No.12252328]

>>12251305
Yes, usually as radicals. So also yes, but it depends on the metal and coating.

[Anonymous No.12252384]

a question regarding effervescent tablets:
I searched a bit and it says that this gas-evolution reaction is between an acid and a (bi)carbonate which produces carbon dioxide gas that bubbles up

but i have this effervescent tablet containing:
Acetylsalicylic acid (aspirin), Caffeine, Sodium, and other ingredients
now i don't see any carbonate here, what makes the reaction to produce gas?!
my theory is that sodium, which is a metal, reacts which aspirin, which is an acid, and it produce hydrogen gas, but i guess it's wrong because hydrogen gas is flammable
can someone tell me what is this gas evolution reaction?!

[Anonymous No.12252412]

>>12252384
Is this bait? Pure sodium metal when put in water creates a sodium hydroxide solution and produces hydrogen gas, the reaction is supposedly quite exothermic so the hydrogen gas can ignite and "explode". That sodium is more than likely sodium bicarbonate or sodium carbonate.

[Anonymous No.12252420]

>>12252412
No bait here
It's literally stated as "Sodium" under the ingredients part
Is it a common thing in pharma industry to refer to sodium carbonate as just sodium?!

[Anonymous No.12252441]

>>12252420
what are the other ingredients.

[Anonymous No.12252480]

>>12252420
See pic related. Sodium (Na) has a very low electronegativity (0.93) while Oxygen (O) has a very high electronegativity (3.5). Whenever there is a difference greater than 2.0 between electronegativities, the bond is considered ionic. You can think of sodium has having a +1 positive charge while the bicarbonate anion has a -1 negative charge, forming an ionic bond that creates a salt. The carbonate anion has a -2 charge, so it takes 2 Na atoms ionically bonded to make it nuetral. Sodium will almost always be bonded to something ionically, like sodium hydroxide or sodium citrate for example. In the case with Alka Seltzer, anhydrous (dry) citric acid, as well as water which has a slightly lower pH than sodium bicarbonate so water acts as an acid toward sodium bicarbonate, is the acid acting on the sodium bicarbonate base.

[Anonymous No.12252512]

>>12252480
Forgot to mention Acetylsalicylic acid also acts as an acid on the sodium bicarbonate base.

[Anonymous No.12253549]

>>12252328
Can they corrode stainless steel?

[Anonymous No.12255933]

If the internet were to be shutdown, what online resources would be best to archive and access offline in order to learn chemical synthesis procedures and safety. Assume the person will have no access to further textbooks, and they have a fundamental exposure to high school chemistry.

[Anonymous No.12255956]

>>12255933
for ~$4k you could archive all of sci-hub
>assuming $200/10TB drive for <100TB total backed up in duplicate

[Anonymous No.12256703]

>>12234443
>Anyone has some cool, (ideally) documented horror stories to scare the shit out of people so that they won't blow up the lab?
Sure:
>Sand Won’t Save You This Time
https://blogs.sciencemag.org/pipeline/archives/2008/02/26/sand_wont_save_you_this_time

[Anonymous No.12256726]

>>12240316
If this happens regularly you probably have a pin or needle in the pipe that catches and aggregates hair and other bits until it is clogging the pipe. Chemicals will clean this mess but that starts the cycle again. So check the pipe for any such puns or needles after your next cleanout.

[Anonymous No.12256798]

>>12255933
This is something I've been thinking about a lot lately.
I've been building a collection of textbook pdfs from all STEM disciplines and datasheets/databooks for electrical engineering.
I got each of those collections copied redundantly across several hard drives, a couple SSDs, and a couple flash drives (for ease of access).
I also used par2 to build 30% redundancy for the tar.gz archive of each collection (one for the textbooks, one for the datasheets/databooks).
with regard to chemistry specifically, I'd say the CRC handbook and Ullmann's encyclopedia would be a good first step. Unfortunately the copies of those floating around are pretty shitty quality... but you can still make out most of what's going on.
Maybe backing up orgsyn would be a good idea. Also organic-chemistry.org would be another good site to backup.
Science madness and rhodium's archive would be an alright idea too since those are mostly text.
Other than that, just download every single chemistry textbook you can get your hands on.

[Anonymous No.12257011]

If civilization were brought to a grinding halt and we were once again in a state of primitive technology, what would be the most useful progression of chemical reactions to take advantage of to rebuild society?

[Anonymous No.12257279]

>>12257011
I think going from fermenting sugars to distilling off ethanol would be one of the first and most important reactions.
Another would be harvesting salicin from the bark of willow trees and turning it into salicylic acid. From there you can go to lots of organic compounds. Might be hard to get acetylsalicylic acid without acetic anhydride (which would be a bitch and a half to get in such a scenario), but you could still use regular salicylic acid as pain reliever/fever reducer.
Getting some form of carbonate would also be important.

[Anonymous No.12257315]

>>12257011
X-ray crystallography

[Anonymous No.12257387]

>>12257011
Oh and obviously the haber process as well

[Anonymous No.12257398]

>>12257011
>progression
Soap making, medicine, explosives, fuel

[Anonymous No.12257471]

>>12257011
>>12257398
For making soap, you'd need sodium hydroxide. You could probably do something based on the chloro-alkali process. Getting a good ion-exchange membrane would be a fucking hassle given the conditions of the scenario, but I think at a certain point it could be feasible.
Bonus of this method is the production of hydrogen gas and chlorine gas. Both of which could be captured and used for other purposes.
From chlorine gas you could get to hydrochloric acid, which is another one of those crucial chemicals that is necessary for so many things.
Getting sulfuric acid would be another important task, but I can't think of any good way to do that off the top of my head given the conditions.

[Anonymous No.12257569]

i already post this in /sqt/ but just in case:
>HCl can be produced by the reaction of H2 and Cl2 in the presence of light. 3.00g of H2 and 140g Cl2 are mixed in a 10.00 L flask at 28.0 °C. Temperature is 28 C and the wavelength of the light is 450nm. What are the partial pressures of gases after the reaction has completed? Assume ideal behaviour for gases.
How the fuck do you solve this one? I was going to the ideal gas law, but then I saw that light plays a role in this. What does light do in this reaction and how can I solve the problem? Help me chembros

[Anonymous No.12258332]

>>12235171
what the fuck is this? there shouldn't be any hydrogens

[Anonymous No.12258370]

>>12236202
What's the actual product that you're getting? it sounds like your gilman reagent is just adding into your ester, but that really shouldn't be happening.

[Anonymous No.12258376]

>>12238295
What's the RF of your compound and solvent system? Also it's easiest to load the column via dryload with celite.

[Anonymous No.12258745]

>>12258370
Thank you for the reply, hopefully you can give me some insights.

The latest product which blew my mind was very pure secondary alcohol. It appears to be the 18 carbon secondary, SATURATED alcohol. there is NO iodine in it which is bonkers. i havent done mass spec on it but its definitely a secondary alcohol from NMR (triplet at 3.6 ppm, J = 7.2 Hz).

in the past the reaction has failed altogether and i usually recover my terminal iodo methyl ester synthon.

I usually let the Gilman reagent "form" over the course of 6 hours, but the last attempt i let it go for 18 h because i didnt see a color change. My cooling bath warmed up to 10C so something definitely happened to my Gilman reagent. When I added my ester to the Gilman reagent, it immediately turned lime green, which I took as a sign of "hey, its still alive"

I am going to try to make the Gilman reagent with the iodo methyl ester instead of the iodopentadecane synthon this week.

you got any pointers?

[Anonymous No.12258748]

>>12258745
ive also been using the same batch of purified copper iodide. the crystals are pure white, and were washed with ether, ethanol, and acetone followed by vacuum oven drying and backflushing with nitrogen.

again, i keep a clean house and all my solvents are rigorously degassed and freshly distilled from 3A sieves. my synthons are pure too.

[Anonymous No.12258788]

>>12257569
>after the reaction is complete
Based on the amounts given and molecular weights, you can see that H2 is the limiting reactant, there is some Cl2 left over after the reaction is complete.
They want the partial pressures of the HCl product and the remaining Cl2.
>light
causes Cl2 to dissociate into 2Cl.
(two chlorine radicals) to initiate the reaction. you don't need to worry about it to do the calculation.

[Anonymous No.12259018]

>>12258788
Thanks for your answer anon.

[Anonymous No.12259876]

hey freshman here, for my chem class we had to do a recrystallization and one of the questions I have to answer is why you shouldn't use vacuum filtration for the hot solution?

[Anonymous No.12260401]

>>12259876
If you're filtering the solution while hot then I guess it's to remove insoluble impurities, so maybe it would cause the solution to cool down and the desired crystals to crash out while filtering. I haven't done a recryst in ages though so could be wrong but that would be my guess.

[Anonymous No.12260432]

>>12260401
>>12259876
that is, the vacuum causes the solvent to cool when it is on the filter paper, and your product precipitates out before passing through the funnel

[Anonymous No.12262177]

>tfw doing comfy comp chem from home due to corona
go computational or regret it

[Anonymous No.12262426]

>>12262177
I'm curious, how much of an overlap is there between the "computational" in computational chemistry and computer science?

[Anonymous No.12262519]

>>12262177
gtfo faggot theorist

>muh ab initio calculations

[Anonymous No.12262547]

>>12235093
That's funny, I'm a chemist and I regret not going into CS. I guess the grass is always greener

[Anonymous No.12262552]

>>12232966
>they can't manipulate 3d objects in their heads
Yo momma has no problem doing that

[Anonymous No.12262569]

>>12235976
Organometallics is best

[Anonymous No.12264646]

Just took my first organic chemistry exam.
As soon as I submitted it I realized I misnamed 2 molecules in really retarded ways.
Anyone know any molecules I can take to kill myself?

[Anonymous No.12264657]

i am really rarted how do i know how many water are bound to a hydrate? ok let's say x salt before boiling the water off weighed 100g and after boiling weighed 50g. what do i do?

[Anonymous No.12264662]

>>12264657
Calculate moles of water lost
[math] \frac{moles of ligand left}{moles of water lost}[/math] should give you a rough stoichiometric ratio

[Anonymous No.12264670]

>>12264646
>misnamed 2 molecules
I wouldn't worry about it if the rest of the exam went ok.
Naming molecules is a pretty small part and far from the most important skill to gain from organic chemistry. Can't remember the last time I bothered naming a molecule myself and not just putting it in chemdraw and getting the name from that.

[Anonymous No.12264674]

>>12264662
[math] \frac{\text{moles of ligand left}}{\text {moles of water lost}} [/math]

[Anonymous No.12264704]

>>12264662
>>12264674
wouldn't that just give me the ratio of water to ligand? i want to know approximately how many molecules were bound to the salt. do i just take the amount of water lost per mol and divide it by the molar weight of water?

[Anonymous No.12264713]

>spiralled into a deep depression because of inorganic chemistry resulting in taking a leave of absence for a quarter
Is it as hard as I catastrophized? Day one lecture, planar nodes, whatever the fuck, and my only response was "all we fucking learned in baby genchem was filling up orbitals"

[Anonymous No.12264723]

>>12232374
Fact: Organic chemistry is the only fun science.

Physics... mutual inductance, transistors, inductance, periodic motion of a pendulum, electromotive force.... yawwwwwwnnnn.....

physical chemistry... thermodynamics, gibbs free energy, reduction potential... dying of boredom over here....

organic chemistry... MIXING TOGETHER CHEMICALS WITH BIG LONG NAMES LIKE A MAD SCIENTIST? EPIC GLASSWARE LIKE IN BREAKING BAD? MAKING COOL SMELLS AND SHIT THAT BLOWS UP? BUILDING MOLECULES? DOING THE GRIGNARD REACTION AND RANTING IN ANGRY GERMAN WHEN IT FAILS???? SIGN ME UP!!!!!

[Anonymous No.12264739]

i really like cucumbers. is there any way to extract the aromatic compounds from a cucumber using home equipment and basic glassware? i can get my hands on 100kg cucumbers if necessary.

[Anonymous No.12264777]

>>12264704
The moles of ligand left after dehydrating: moles of water lost through dehydration give you the molecular ratio,
Is this like a Copper(II) sulfate lab? Give me your numbers and I can walk you through it.

[Anonymous No.12264795]

>>12232905
It'll start to correlate when you get to OChem.
To get to that level though you just have to build hours in the lab. Eventually you'll be comfortable using the tools at your disposal and adding new ones when needed.

[Anonymous No.12264924]

>>12264777
it's not an experiment but i am supposed to be able to do this. let's say i have 100 grams of magnesium sulfate but i don't know the how many moles that is because i don't know how many water molecules are bound. i heat the water away and i am left with let's say around 60g grams of completely dry salt so water was 40 percent of the total weight. do i just multiply molar weight of the salt with the percentage and divide the number i get with the molar weight of water?

[Anonymous No.12264937]

>>12264924
Whatever mass you are left with after heating is the mass of the salt.

Whatever mass you lose (starting mass - ending mass) is the mass of water.

When you convert both masses to moles, you wall have the ratio of molecules of salt to molecules of water.

If there are 4 times as many moles of water as there are salt, that means there are 4 water molecules for every salt molecule.

[Anonymous No.12264946]

>>12264937
thanks i get it now

[Anonymous No.12265330]

>>12258748
It sounds like you aren't actually forming your Gilman reagent. Have you tried to form your alkyl lithium just from the alkyl halide and lithium metal?

Also a quick search of Sci-finder has very few examples but they usually form a Grignard first.

Going off this paper: Huber et al. J. Organomet. Chem. 2013, 744, 144-148. see pic related.

[Anonymous No.12265433]

Help.
I have this semi obscure reagent called sulfamic acid and I can find barely any info on it, best source of docs I've been using are from sciencemadness.
The problem is as follows: I'm trying to get sulfuric acid from said sulfamic acid.
In other words:
How do I turn this fucker
>H(SO3)(NH2)
Into this fucker?
>H2SO4
Please, no electrolysis or chlorine gas method; one I'm too based to setup, the other generates NCl3 and I don't want my lab to blow up.
My current idea was oxidizing away the ammonia under the acid's zwitterionic form with NaClO3 (from boiled bleach/javel or matches at worst) but that didn't work at all.
I do have some iodic acid but the quantities are probably of under 50ml 10%. Using nitrous acid or nitric is also out of the question,and NaClO reacts do give N,- chlorosulfamates according to wiki, which sounds like a good way to get cancer and no sulfuric acid. Also, i tried the urea-decomposition method, doesnt works below 100 Celsius for sure.
My sulfamic acid is between 5 to 15% for some fucking reason but I can probably boil it down to its powdered form.
Someone help. I've been thinking of using hydrogen peroxide in a dash of madness but I don't know if I have the strength to use something such a strong oxidizer on such a (relatively) strong reducer.

[Anonymous No.12265445]

>>12265433
This is fucking idiotic, just buy sulphuric acid.

[Anonymous No.12265468]

>>12265445
I can't, did you bother reading this? I have a fuckton of sulfamjc acid laying around but virtually every drugstore here won't sell sulfuric and instead go with virgin HCl camouflaged as drain cleaner. And don't get me started on ebay who pretends to sell sulfuric when it's, guess what? Sulfamic acid, which is the reason i have 20 litres of that piece of shit of an acid. And of course, here we have Anon who can't fucking give a try to find how to recycle a load fuckton of that chemical that literally 30 people on earth know about into its starting components (or at least some of them). If I had the ability and lack of will I'd have done that since months.
>also you're bri'ish

[Anonymous No.12265494]

>>12265433
>>12265468
sulfuric acid is retarded cheap. look at MSDS's until you find something that works for you. even if you live in some restricted country, you've got a lead-acid battery in your car, and sulfuric acid is used to refill those batteries, so find a place that you can buy it as a consumer.

[Anonymous No.12265520]

>>12265494
wait you're right
why did i not fucking think of car battery refills
>tfw iq below temperature asl

well ty anon, ill use that info preciously
what can i do with 20l of sulfamic acid now though

[Anonymous No.12265531]

>>12265468
Generally, these kind of small molecules are treated more as "building block" type of things due in part to their stability. The S-N bond is actually pretty strong so you're going to need some pretty harsh conditions to break it. You've already given us a number of constraints that exclude any practical method of oxidizing that bond, so unless you're willing to relax those, you're kind of fucked.

[Anonymous No.12265541]

Red pill me on deep eutectic solvents

[Anonymous No.12265568]

>>12265531
actually, there might be one thing that i could do, since sulfamic is a rather strong acid and has similar properties so sulfuric acid, a sciencemadness poster was talking about using calcium nitrate to produce HNO3 in-situ therefor oxidizing that ammonia away.
im also thinking about using a catalyst and "burning" the NH3 away, like the catalytic oxidation of ammonia using platinum.
Could phosphorus pentoxide work as an oxidizer? though it'd suck since my sulfamic acid is in solution and the oxide'll react with the water, i don't see why it couldn't oxidize away once the water is entirely replaced by phosphoric acid unless the sulfamic acid isn't soluble in H3PO4
I might retry the chlorate procedure as it might just have been from low concentrations and/or temperatures later on tomorrow

[Anonymous No.12265667]

>>12239185
>Sources of error: I probably fucked up in a couple steps

[Anonymous No.12265725]

>>12265568
You can get your hands on P2O5 but not sulfuric acid? the fuck?

[Anonymous No.12266208]

>>12265330
>Huber et al. J. Organomet. Chem. 2013, 744, 144-148

thanks for the help, just pulled up that paper.

by the way I did some reading and i found pic related. apparently with larger cuprate moieties, the solubility of the lithium iodocuprates increases (vs dimethyl cuprates which precipitate)

J. Am. Chem. Soc. 2014, 136, 5765−5772

i think i will either go through the Grignard route or maybe try the cyanocopper route

[Anonymous No.12266274]

>>12265568
use it for what it's used for. you're not going to turn it into anything useful. clean your shower and toilet with it. you got limescale on your sink? clean it with that. some old tarnished silverware? use it for that.
evaporate it and turn it into a powder and put it in a box somewhere and use it when you need it. it's not going to go bad, but it's pretty useless. you're burning money trying to make it into anything.

and not to be rude, but maybe do some more reading before you get yourself in trouble. not legally, i just mean wasting money or hurting yourself. i'm getting some inexperienced vibes from your posts, and you can really fuck yourself up. it's like you've got 20 liters of sewage and you're trying to make it into distilled water, instead of just buying distilled water.
i don't know you, and i'm not your dad, maybe i'm misreading it. you don't have to qualify yourself to me, i'm going to close the thread after i post this. i'm just saying that the questions you're asking are the sort of questions that you ought to be confident in the answer to, if you are going to attempt.

[Anonymous No.12266383]

>>12235093
Once had a 700mg benadryl trip when I was a wee lad. Crazy ass times man

[Anonymous No.12267123]

Is it possible to go from phosphate salts to PCl3 in one pot? I hate the idea that every usable phosphorus compound has to go through P4 as an intermediate.

[Anonymous No.12267163]

>>12256798
There is organisation called "maps" literally maps.org and they provided few research papers, I found even whole LSD from Indole there.

Ever heard of libgen<dot>rs? If you've got some books that aren't there, just please share with world over there.

It's direct download backed up on torrents.

[Anonymous No.12267185]

>>12257011
There's PH indicator possible for extraction in the forrest, growing on old trees as symbiosis of fungus and photosyntetic system.

[Anonymous No.12267186]

>>12267163
>LSD from Indole there
sauce? I couldn't find it

[Anonymous No.12267263]

>>12267186
https://www.researchgate.net/publication/8937046_A_New_Synthesis_of_Lysergic_Acid

Bromo-indole and some acid, but not ergotamine requirement. Just tell me if it's helpful.

[Anonymous No.12267273]

>>12267263
https://sci-hub.se/10.1021/ol0354369

[Anonymous No.12267277]

>>12267186
Where I visited last time bibliography looked different and there ware download links but I could manage to write back-up script in time.

[Anonymous No.12267284]

How to test for ergotamine alkaloids with something easy? With no spectroskope or gas chromatography available?

There's a mold, that's not purple, but it appeared in my test from rye bread, and also raw rye at room temperature.

It's white, not purple therefore it's not exactly what I looked for, but still, it's mold on rye, there is some tiny evolutionary possibility that it could produce ergotamine.

How to test for it, or could somebody verify? Just wet rye at room temperature, and mold should appear.

[Anonymous No.12268201]

>>12262426
hardly any, unless youre writing your own software in FORTRAN or something, and we just get comp sci dudes to do any real comp sci stuff, then use the result

>>12262519
not just ab initio, semi-empirical too. and next time you need someone to sort out a mechanism for you because your '''experiments''' are too hard youll be gagging for me

[Anonymous No.12268300]

>>12268201
Kek I'm the organocuprate guy >>12266208, literally in the boat you described. I appreciate you computational autists. Thanks for your work

[Anonymous No.12268524]

is it true experimentalists never use LATEX? why?

[Anonymous No.12268735]

>>12268524
It's reactive to a wider array of chemicals compared to nitrile.
That being said there are times latex is better suited for handling different chemicals like fuming nitric acid.

[Anonymous No.12269082]

>>12268735
ahahaha fully lollling at this. god experimentalists are technophobes.

[Anonymous No.12269313]

>>12267163
I'm the guy you're replying too, and I actually have a MAPS water bottle that I bought as a donation!
Nearly everything I got is from libgen though, unfortunately, so I have nothing to add.

[Anonymous No.12269317]

>>12268201
>hardly any
alright, yeah I figured. I was just curious. Thanks anon.

[Anonymous No.12269895]

>>12269317
although theres lots of python if you want, im currently working on making a nice workflow for drug design - essentially linking together lots of different programmes with python

[Anonymous No.12270152]

https://www.cnbc.com/2020/10/24/how-a-digital-breakthrough-could-revolutionize-drug-industry.html

Is this Chemistry story as important as it seems? These people are literally making chemical synthesizers. I'm thinking nanotech, but one doctor has it a setup that just does everything a person does like stir this long, heat this long, etc. I'm impressed.

[Anonymous No.12270162]

>>12270152
http://www.chem.gla.ac.uk/cronin/chemify/
The guys has a freaking parts list. I want one.

[Anonymous No.12270189]

>>12233155
Thinking your hot shit cause you can name hydrocarbons lol

[Anonymous No.12270253]

>>12232374
What’s the best chemistry degree to get for overall experimental knowledge/job prospects?
What’s the most valuable in other words that won’t limit your breadth of options?

[Anonymous No.12270791]

>>12270253
i went in with this sort of perspective, and i chose chemical engineering, because you often can do chemistry jobs with a chemical engineering degree. plus, it's sufficient to get into grad school for chemistry stuff.
however, i ended up regretting it and switching majors. it's less "chemistry", and more "designing factories that just so happen to make chemicals".
if you wanted to go pure chemistry, anything related to petrochem is good. polymers, for example. biotech is also a growing field but we're kind of early on it, and i figure it will be a couple decades until it grows very rapidly.
inorganic chemistry is less of a good choice. analytical chemistry is actually pretty wide in terms of what you can utilize it for, but the work may or may not be what you are interested in.

ultimately though, what your undergrad degree is titled is not super important. you could do the majority of chemistry jobs with any chemistry, or biochemistry, or chemical engineering degree. i suggest that you pretend that you are applying for jobs right now and pretend that you graduated college. look for jobs that interest you, and see what they actually want as a degree.

[Anonymous No.12270844]

>>12270791
Good advice desu senpai, and I appreciate the perspective.
I had been considering engineering for a while but the work itself doesn’t interest me as much.
Ideally, if I’m doing petrochemical work I’d want to be working in the green energy field, but I imagine every year that’ll become more valuable employment wise.
Thanks mate

[Anonymous No.12270906]

>>12270791
>i suggest that you lie, it is good to lie

[Anonymous No.12271524]

>>12270906
?
i'm not suggesting he actually apply for jobs, but to look through glassdoor and indeed and shit at actual job listings, and see what he could do if he actually were a graduate today.