PH of a Cell


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Michelle Nwufo 2G
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Joined: Fri May 18, 2018 3:00 am

PH of a Cell

Postby Michelle Nwufo 2G » Mon Mar 11, 2019 6:50 am

How do you calculate the pH of a cell, using the Nernst equation? Or can we use the standard potential?
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EllerySchlingmann1E
Posts: 76
Joined: Fri Sep 28, 2018 12:24 am

Re: PH of a Cell

Postby EllerySchlingmann1E » Mon Mar 11, 2019 8:44 am

You have to use both. Plug in the calculated (or given) standard potential of the cell into the Nernst equation along with the cell potential measured by the ion-selective electrode (should be given in the problem as well). Then you want to create a Q expression for the reaction and plug that in too. To find the pH, you'll have to manipulate the ln (or log) Q expression to get the conc. of H+ by itself and then calculate pH from that. [H+] = 10^-pH. Hope that helps!
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