Nernst equation for cell potential (at 25°C):
AE = E° + 0.0591/n × log Q
BE = E° - 0.0591/n × log Q (Nernst, log form)
CE = E° + Q
DE = E° / Q
Answer & Solution
Correct answer: B. E = E° - 0.0591/n × log Q (Nernst, log form)
E = E° - (RT/nF) ln Q. At 25°C: E = E° - (0.0591/n) log Q. Q = reaction quotient. At equilibrium E = 0, Q = K, giving E° = (0.0591/n) log K (relates E° to K).
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