If the cell reaction involves ions in solution,as the cell reaction in a galvanic cell continues,
A)E for the cell increases.
B)E for the cell decreases.
C)E° for the cell increases.
D)E° for the cell decreases.

Question

Quizplus · Accepted Answer

As the cell reaction in a galvanic cell continues, the concentration of reactants decreases and the concentration of products increases, which causes a decrease in the free energy change (ΔG) and therefore a decrease in the EMF (E) for the cell. This is consistent with Le Chatelier's principle, which states that a system at equilibrium will respond to any stress imposed upon it in such a way as to counteract the stress and reestablish equilibrium. In this case, the stress is the consumption of reactants and the formation of products, which causes a shift in the direction of the reverse reaction, resulting in a decrease in E for the cell. However, the standard electrode potential (E°) for the cell remains unchanged since it is a measure of the inherent tendency for the reaction to occur under standard conditions.

If the Cell Reaction Involves Ions in Solution,as the Cell