Deriving the Nernst Equation


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Verity Lai 2K
Posts: 100
Joined: Sat Aug 24, 2019 12:18 am

Deriving the Nernst Equation

Postby Verity Lai 2K » Wed Feb 26, 2020 3:12 pm

Could someone please remind me how to derive the Nernst equation??

Veronica_Lubera_2A
Posts: 106
Joined: Sat Sep 14, 2019 12:16 am
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Re: Deriving the Nernst Equation

Postby Veronica_Lubera_2A » Wed Feb 26, 2020 3:41 pm

You need 2 formulas:

1. DeltaG=-nFE*
2. DeltaG=DeltaG* + RTlnQ

Combine rections:
-nFE(cell)=-nFE*(cell)+RTlnQ
Therefore,
E(cell)= E*(cell)-(RT/nF)lnQ

It is also important to know that at 25 degrees C (so standard conditions),

E(cell)= E*(cell) - (0.0592V/n)logQ


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