A copper electrorefining cell operates on the half-reaction

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Energy from Physics, Ch Storing energy: cells, rotors, air, heat and hydrogen

Problem

A copper electrorefining cell operates on the half-reaction Cu2++2e−→Cu\mathrm{Cu^{2+} + 2e^- \to Cu}, with z=2z=2 electrons transferred. During operation copper dissolves at the anode, and the Cu2+\mathrm{Cu^{2+}} concentration next to it rises to five times its initial value. Treating the activity of Cu2+\mathrm{Cu^{2+}} as proportional to its concentration, and taking the cell temperature as 298 K298\,\mathrm{K}, find the resulting shift in that electrode's equilibrium potential.

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