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/sci/ - Science & Math

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965546 No.965546 [Reply] [Original]

chem help /sci/
having trouble with ONE QUESTION. i'm not asking you to do my homework. If someone could be s kind as to tell me how i should go about this that would be great. I will tell you what i think i need to do and you can tell me if im an idiot or not. thanks.

Q. Given the following acid dissociation constants: Ka (HF)=7.2x10^-4
Ka(HCN)=4.0x10^-10
determine the equilibrium constant for the reaction below.
HCN+F^- <--> CN^- + HF

so what i've done is said ka of HCN is 4.0x10^-10 and Kb of F- is Kw/Ka.

I dont know how to connect these two to make an overall equilibrium constant


please help, do some /sci/

>> No.965552

or do i simply multiply the two Ka's together :S

>> No.965571

inb4 an answer >.>

>> No.965575

this place has to have at least one /sci/entists who can help, or is this place really just full of engineers?

>> No.965580

umm products over reactants?

>> No.965596

>>965580
are you saying all i have to do is:
(Kw/Ka of F-)/(Ka of HCN)
?

>> No.965599
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965599

>>965575
did you say engineers?
can it be engineering tiem nao?

>> No.965604

>>965599
not yet, please.

>> No.965610

>>965580
??? well?

>> No.965617

you've just confused me further

>> No.965625

please someone helpppp

>> No.965626
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965626

>>965604
sad engineer is sad

>> No.965633

>>965626
lol'd

>> No.965637

>>965626
naw, well you can have engineering tiem when i get a good answer. hell, i might even let you have CIVIL engineering time. :)

>> No.965640

damn you all help me

>> No.965654
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965654

would if I could, but /sci/ is really /engineering/
no chemists around here

>> No.965650

WOOOOOOO ENGINEERING TIME!!!!

>> No.965653

>>965650
no

>> No.965655

>>965654
:(

>> No.965660

[CN^-].[HF]
-------------- = K
[HCN].[F^-]

But, I don't really get what you want, Belgium here =s

>> No.965666
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965666

i'm a good engineer

>> No.965679
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965679

>>965666
wow! we should celebrate with gay sex!

>> No.965681

>>965660
so what is this with numbers?

>> No.965687

>>965660
pls come back :(

>> No.965686

>>965546

Testing....

asdfihasdoifh sLKijqw mgclq vewjth ioeqr4wiot u3 4tgklr3ew

>> No.965694

>>965660
!!! NUMBERS? please

>> No.965709

bumping for solution

>> No.965726

please help

>> No.965756

nothing?

>> No.965759

>>965756
bumping for the op

>> No.965771

someone do some science damn it

>> No.965816
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965816

>>965771
again I say, /sci/ is just engineers!
Real scientist dont waste there time being a fag on the net!

>> No.965928

>>965694
Just add the concentrations.
Could be usefull.
Ka = [H3O+] . [A^-]
------------------
[HA]