What is the relationship between the standard cell potentials,E°,for the following two galvanic cell reactions? I.2 Ag⁺(aq) + Sn²⁺(aq) → Sn⁴⁺(aq) + 2 Ag(s)
II.2 Ag(s) + Sn⁴⁺(aq) → Sn²⁺(aq) + 2 Ag⁺(aq)

Question

Quizplus · Accepted Answer

For the reverse reaction, the sign of the standard cell potential is reversed. Therefore, if we reverse both reactions, we get:
I. SnS1U1P14+S1S1P0(aq)+ 2 Ag(s) → 2 AgS1U1P1+S1S1P0(aq)+ SnS1U1P12
II. 2 AgS1U1P1+S1S1P0(aq)+ SnS1U1P12 → 2 Ag(s) + SnS1U1P14+S1S1P0(aq)
Comparing these two reactions, we can see that they are the same except for the reversed order of the reactants and products. Therefore, the standard cell potentials of these two reactions are equal in magnitude but opposite in sign, i.e. E°(I) = - E°(II).

What Is the Relationship Between the Standard Cell Potentials,E°,for the Following