The Nernst equation gives cell EMF at non-standard conditions. For a half-cell Mⁿ⁺ + ne⁻ → M, it is:
AE = E°/n
BE = E° - (RT/nF) ln Q
CE = E° + (RT/nF) ln Q
DE = E° (no correction)
Answer & Solution
Correct answer: B. E = E° - (RT/nF) ln Q
Nernst equation: E = E° - (RT/nF) ln Q where Q is reaction quotient. At 25°C: E = E° - (0.0591/n) log Q (with log base 10).
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