13. Based on Latimer/Frost principles, the standard reduction potentials for Cu in acid are (+0.15 V — Electrochemistry Chemistry Question
Question
13. Based on Latimer/Frost principles, the standard reduction potentials for Cu in acid are $Cu^{2+} \rightarrow Cu^+$ (+0.15 V) and $Cu^+ \rightarrow Cu$ (+0.50 V). Does $Cu^+$ disproportionate in solution, and what is the $E^\circ$ for this process?
Answer: A
💡 Solution & Explanation
Disproportionation: $2Cu^+ \rightarrow Cu^{2+} + Cu$. Anode: $Cu^+ \rightarrow Cu^{2+} + e^-$ (oxidation, $E^\circ_{OP} = -0.15 V$). Cathode: $Cu^+ + e^- \rightarrow Cu$ (reduction, $E^\circ_{RP} = +0.50 V$). $E^\circ_{cell} = 0.50 - 0.15 = 0.35 V$. Since $E > 0$, it is spontaneous.
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