6. Given standard reduction potentials: and . What is the standard electrode potential of the half-c — Electrochemistry Chemistry Question
Question
6. Given standard reduction potentials: $E^\circ(Cu^{2+}/Cu) = 0.337 V$ and $E^\circ(Cu^{2+}/Cu^+) = 0.153 V$. What is the standard electrode potential of the $Cu^+/Cu$ half-cell?
Answer: C
💡 Solution & Explanation
Use Gibbs free energy. $dG_1 = -2F(0.337)$, $dG_2 = -1F(0.153)$. Target: $Cu^+ + e^- \rightarrow Cu$. $dG_3 = dG_1 - dG_2 = -0.674F - (-0.153F) = -0.521F$. Since $dG_3 = -1F(E^\circ_3)$, $E^\circ_3 = 0.521 V$.
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