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For the cell reaction, Cu2+ (C1, aq) + Zn(s) → Zn2+ (C2, aq) + Cu(s) of an electrochemical cell, the change in free energy, ΔG, at a given temperature is a function of

1. ln (C1)
2. ln (C2/C1)
3. ln (C2)
4. ln (C1 + C2)

Correct answer: ln (C2/C1)

Solution

The change in free energy, ΔG, for an electrochemical cell is related to the reaction quotient Q, which in this case is C2/C1. Hence, ΔG depends on ln(C2/C1).

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