Discussion
The electrochemical cell stops working after some time because ________
Answer: C
The cell stops when the electrode potentials of the two electrodes become equal.
Current flows only while there is a potential difference. As the reaction proceeds the concentrations change, and by the Nernst equation \[E = E^\circ - \frac{0.0591}{n}\log Q\] the two half-cell potentials drift together until \(E_{cell}=0\). At that point the cell has reached equilibrium, and \(Q = K\).
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