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/sci/ - Science & Math


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9271786 No.9271786 [Reply] [Original]

why is the dissociation constant of water pic related? Why isn't it divided by the moles of H2O?
I was thinking [H2O] must be approximately 1, but that's retarded because there are 50+ moles in 1000g of water.

>> No.9271794

>>9271786
That's the reason why, any change in H2O concentration is negligible.

>> No.9271797

>>9271786
The concentration is too fucking great so we just ignore it.

Basically what >>9271794 said

>> No.9271799

>>9271794
I don't get it - can you link me to an in-depth explanation? Thought the equilibrium constant was just the product of the moles of products, divided by the moles of reactants.
I meant equilibrium constant in OP btw, not dissociation constant. Is my textbook wrong in saying this is the equilibrium constant?
>>9271797
see above, I don't get it

>> No.9271809

>>9271799
What don't you get? Also Equilibrium constant uses concentration (molarity) not moles my friend.

>> No.9271818

http://chemed.chem.purdue.edu/genchem/topicreview/bp/ch17/water.php I've got it now. Pretty stupid but whatever, it's just chemistry

>> No.9271854

>>9271818
it's one of those times where it's a simplification for general use even if it's not precisely correct

>> No.9272002

>>9271794
>>9271797
>>9271809
>>9271854
anyone still here? I was trying to bait chemists with
>it's just chemistry
but I seriously need help.
I understand the dissociation constant thing but my chemistry textbook is being retarded I think.
>"Ka is known as the dissociation constant of the acid. An expression analogous to this can be written for Kb, the dissociation constant of a base. Note that [H2O does not appear explicitly in the denominator, because the concentration of the solvent H2O is considered to be 1 mol/litre"
What the fuck does that mean? the water is 55 mol/l. I'll just ignore it and assume it's wrong but if that's clicking for anyone, please explain.

>> No.9272008

>>9272002
you're absolute, you're asking yourself for help within your own sophisticated illusion

>> No.9272976

>>9272002
What class is this

>> No.9273662

>>9272002
you didnt adjust for temperature