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Nernst

Posted: Wed Mar 04, 2020 7:21 pm
by Ian Morris 3C
When should we use logQ vs lnQ.

Re: Nernst

Posted: Wed Mar 04, 2020 7:25 pm
by Maya Beal Dis 1D
If you are using the shortcut E=E(naught)-(0.05916/n)logQ, you need to use log. I think there is another number shortcut if you are using the equation with natural log.

Re: Nernst

Posted: Wed Mar 04, 2020 7:31 pm
by 605110118
Ln is easier and often used more.

Re: Nernst

Posted: Wed Mar 04, 2020 7:42 pm
by Matt Sanruk 2H
Maya Beal Dis 1D wrote:If you are using the shortcut E=E(naught)-(0.05916/n)logQ, you need to use log. I think there is another number shortcut if you are using the equation with natural log.


Is this the equation given on the equation sheet?

Re: Nernst

Posted: Thu Mar 05, 2020 4:06 am
by Celine 1F
I don't think I saw the shortcut equation with .05916 on the equations sheet so I used Ln

Re: Nernst

Posted: Thu Mar 05, 2020 7:38 am
by Daria MacAuslan 1H
You usually use ln, just because it is more direct and it is also given to us on our equation sheets. If you want to use log however, just multiply by the conversion factor, it shouldn't really matter in the end

Re: Nernst

Posted: Thu Mar 05, 2020 10:34 am
by Katie Kyan 2K
You can use either but if you are trying to find the pH as in some of the HW problems, it would be easier to use the log version so you can find -log{H3O+].

Re: Nernst

Posted: Fri Mar 06, 2020 12:09 am
by Anthony Hatashita 4H
You can use either, the equation sheet lists both so whichever you are most comfortable using is best.

Re: Nernst

Posted: Fri Mar 06, 2020 1:12 am
by Diana Andrade_4F
You can use whichever you want to use!

Re: Nernst

Posted: Fri Mar 06, 2020 10:28 pm
by Ying Yan 1F
When a problem is asking for you to solve for the pH or when you are given pH in a cell diagram, that's when you would usually use log instead of ln. Hope this helps!

Re: Nernst

Posted: Fri Mar 06, 2020 11:45 pm
by 205405339
lnQ can always be converted to logQ thru the equation: lnQ=2.303logQ