Calculating E°cell

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ng1D
Posts: 43
Joined: Wed Sep 18, 2019 12:17 am

Calculating E°cell

Postby ng1D » Sun Mar 01, 2020 5:02 pm

What is the difference between E°cell= E°cathode − E°anode and E°cell= E°+E° and when would I use one over the other?

Dina 2k
Posts: 57
Joined: Wed Sep 18, 2019 12:17 am

Re: Calculating E°cell

Postby Dina 2k » Sun Mar 01, 2020 5:13 pm

E°cell= E°cathode − E°anode is used when the half reactions are both in reduction form so ie: Cu ^2+ + 2e -> Cu. E°cell= E°cathode + E°anode is used when the half reaction of the anode is in its real state, oxidized, ie: Cu -> Cu^2+ + 2e. if done right, both ways give you the same answer.

John Liang 2I
Posts: 102
Joined: Fri Aug 30, 2019 12:18 am

Re: Calculating E°cell

Postby John Liang 2I » Sun Mar 01, 2020 5:17 pm

The first way is taking the standard reduction potentials of each (when both are going in same direction). The second way also works bc you switch the reduced half equation and flip the E sign so it still holds to be true.


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