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6:50 AM

@user21820 do you know how to do math edits on wikipedia

@DavidReed I don't do math on wikipedia, because the editors there are obnoxious and will delete trivial mathematical statements just because there is no mathematician stupid enough to waste time publishing it.

(So I've long forgotten how to do it.)

David Reed

Ah ok

user21820

← 4 messages moved from Logic

@DavidReed Anyway it's nice to see you again. What have you been up to?

David Reed

I want to correct an error in the van't hoff equation derivation. The same error appeared here on chem SE.

and was likely the source of misinformation

Not much really

user21820

I see. I've not heard of that equation, so I probably can't offer any good comment.

Holo

6:58 AM

@DavidReed if you on the phone, after tapping "edit" tap on the picture of the formula and then on the top right tap "edit" again, on PC I don't know

David Reed

weird

Holo

I edit wiki only once and it was on the phone, so I don't know how it even looks on PC

David Reed

@user218280 yesterday the answerer thanked me for pointing out the error. He happens to be a moderator, he corrected the error by providing an amended derivation and then deleted my comment lol.

The page has 17.2k views and his response had received 7 upvotes without anyone noticing.

user21820

Some people always try to remove evidence of their errors.

In this case, they could say that your comments are no longer needed, but I still think it's basic courtesy to acknowledge the error and credit the one who pointed it out, unless it is a very minor or typographical error.

David Reed

Currently Wikipedia has the same error:

https://en.wikipedia.org/wiki/Van_%27t_Hoff_equation

In the section: "development from thermodynamics", $\Delta H^\circ$ is actually not constant with temperature, so can't be treated as a constant when differentiating that line

user21820

7:14 AM

@DavidReed At least it does say "Provided that ΔH⊖ and ΔS⊖ are constant".

David Reed

@user21820 Later I believe, when using that approximation to obtain the integrated form of the equation

The differential form is valid in all contexts and can be derived from the gibbs-helmholtz equation

user21820

Oh.

David Reed

@user21820 Here is the (now correct) derivation (the other points out the dependence on temp in the last paragraph):

https://chemistry.stackexchange.com/questions/32385/derivation-of-van-t-hoff-equation-for-temperature-dependence-of-equilibrium-con

user21820

I see.

8 hours later…

user21820

3:06 PM