Standard Electrode
(Half-Cell) Potentials Eo
Since the overall cell reaction involves the oxidation of zinc, we
reverse the Zn reaction, and change the sign to get the cell potential:
Zn(s) Zn2+(aq) + 2 e- -Eozinc(-Eoanode) [oxidation]
Cu2+(aq) + 2e- Cu(s) Eocopper(-Eocathode) [reduction]
The overall redox reaction is the sum of these two:
Zn(s) + Cu2+(aq) Zn2+(aq) + Cu(s)
Eocell = Eocopper + (- Eozinc) = Eocopper - Eozinc
E0cell = Eocathode - Eoanode
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