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Calculating standard cell potentials

Posted: Fri Mar 16, 2018 11:58 am
by ZoeHahn1J
When calculating the standard cell potential of a reaction, do we always flip the oxidation half reaction? I know that for galvanic cells, Ecell has to be greater than zero, so we flip the larger value, but I'm not sure about non-galvanic cells.

Re: Calculating standard cell potentials

Posted: Fri Mar 16, 2018 12:05 pm
by Tasnia Haider 1E
You want E to be positive because the reaction has to be spontaneous which only happens in galvanic cells. So, I believe that you have to flip the oxidation side if you are using that method of calculating E.

Re: Calculating standard cell potentials

Posted: Fri Mar 16, 2018 2:52 pm
by ZoeHahn1J
Right, but would there ever be a time when standard E is negative for a not galvanic cell, or when we would have to flip the reduction rxn for a galvanic cell?