### Nernst Equation

Posted:

**Tue Mar 03, 2020 5:02 pm**I've seen the different versions of the Nernst equation but when do we know whether to apply one of the other?

Created by Dr. Laurence Lavelle

https://lavelle.chem.ucla.edu/forum/

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=142&t=61200

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Posted: **Tue Mar 03, 2020 5:02 pm**

I've seen the different versions of the Nernst equation but when do we know whether to apply one of the other?

Posted: **Tue Mar 03, 2020 5:04 pm**

I think it depends on what information you're given, so what you're working with. I believe there is only two versions of the Nernst equation though: one with lnQ and one with logQ.

Posted: **Tue Mar 03, 2020 5:40 pm**

Letty Liu 2C wrote:I think it depends on what information you're given, so what you're working with. I believe there is only two versions of the Nernst equation though: one with lnQ and one with logQ.

Got it! But when do we use lnQ rather than logQ and vice versa?

Posted: **Tue Mar 03, 2020 5:57 pm**

It doesn't really matter whether you use the ln Q or log Q equation. Some people prefer the log Q equation because on the equations sheet, you are given 0.05916V/n and you do not have to calculate R*T/nF, which you have to calculate with the ln Q equation.