The standard reduction potentials of Cu2+ | Cu and Cu2+ | Cu+ are 0.337 V and 0.153 V, respectively. — Electrochemistry Chemistry Question

💡 Solution & Explanation

For $Cu^{2+} + 2e^- \rightarrow Cu$, $\Delta G_1^\circ = -2F(0.337) = -0.674F$. For $Cu^{2+} + e^- \rightarrow Cu^+$, $\Delta G_2^\circ = -1F(0.153) = -0.153F$. Subtracting the second from the first gives $Cu^+ + e^- \rightarrow Cu$, with $\Delta G^\circ = -0.674F - (-0.153F) = -0.521F$. Thus, $E^\circ = 0.521$ V.