cell potentials

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705121606
Posts: 68
Joined: Wed Sep 18, 2019 12:17 am

cell potentials

Postby 705121606 » Mon Feb 24, 2020 4:52 pm

For galvanic cells it says we have to have a positive potential difference therefore we have to identify it as anode and cathode in the way that would make the cell potential positive. When would we do this instead of identifying the half reactions and determining if it is spontaneous through the sign of the cell potential?

Paul Hage 2G
Posts: 105
Joined: Thu Jul 25, 2019 12:17 am

Re: cell potentials

Postby Paul Hage 2G » Mon Feb 24, 2020 4:59 pm

Galvanic cells have a positive Ecell value. However, the E value of the half reactions could be negative, as long as the Ecell value is positive. The magnitude of E for the half reactions must be worked out so that the overall Ecell value is positive.


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