20. The reduction potential of a standard metal-insoluble salt electrode like the Calomel electrode — Electrochemistry Chemistry Question

💡 Solution & Explanation

The Nernst equation for the calomel reduction half-reaction $Hg_2Cl_2(s) + 2e^- \rightarrow 2Hg(l) + 2Cl^-$ is $E = E^\circ - (0.0591/2)\log[Cl^-]^2 = E^\circ - 0.0591\log[Cl^-]$. It relies purely on the anion concentration.