How does the cell potential (Ecell) change as a galvanic cell discharges and approaches dynamic chemical equilibrium?
Answer and explanation
Correct answer: B. Decreases continuously until Ecell = 0 at equilibrium
As reactants convert to products, the reaction quotient Q increases. By the Nernst equation (E = E° - (RT/nF)*ln Q), Ecell declines continuously until dynamic equilibrium is reached (Q = K), where Ecell = 0 V (a dead battery).
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