If I have a Galvanic cell of Nickel and Gold where Nickel is (Ni->Ni^+2 + 2e-) and the oxidation of gold is (Ag^+->Ag + e-) then do I need to double the cell potential of gold (+0.80) if I'm trying to find the standered cell potential (volatage)?

Answer 1

If you add the Au (note Au and not Ag or it may be the other way around; i.e., you may have called Ag gold whereas it is silver) Eo value to the Ni Eo value (one an oxidation and the other a reduction), no, you do not double the E value of the Ag.