The standard reduction potential of oxygen in acidic solution is +1.23 V. What is the standard reduc — Electrochemistry Chemistry Question

💡 Solution & Explanation

Acidic reduction: $O_2 + 4H^+ + 4e^- \rightarrow 2H_2O$ ($\Delta G^\circ = -4F(1.23) = -4.92F$). Water dissociation: $4H_2O \rightarrow 4H^+ + 4OH^-$ ($\Delta G^\circ = -RT \ln(10^{-56}) = 3.304F$). Adding gives $O_2 + 2H_2O + 4e^- \rightarrow 4OH^-$. $\Delta G^\circ = -4.92F + 3.304F = -1.616F$. $E^\circ = -(-1.616F) / 4F = +0.404$ V.