Voltaic Cell Voltage and Equilibrium
A student observes that the voltage of a voltaic cell decreases as the cell operates. The student concludes that the voltage becomes zero because the reaction quotient, Q, is approaching the equilibrium constant, K. Which statement best identifies the flaw in the student’s conclusion?
A
Decreasing voltage indicates the cell is moving away from equilibrium.
B
Voltage decreases as Q approaches K, but it does not drop to zero until Q equals K.
C
Voltage is independent of the reaction quotient in voltaic cells.
D
An increase in Q always increases the cell voltage, regardless of K.
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