At electrochemical equilibrium in a chemical cell, the cell potential is what value?

Prepare for the NLN PAX Science Exam with flashcards and multiple choice questions. Each question includes hints and detailed explanations to boost your confidence and exam readiness.

Multiple Choice

At electrochemical equilibrium in a chemical cell, the cell potential is what value?

Explanation:
When a redox reaction in a cell reaches equilibrium, there is no net tendency for electrons to flow between the electrodes. The driving force for the reaction is zero. The link between Gibbs free energy and cell potential, ΔG = -nF Ecell, means that at equilibrium ΔG = 0, so the cell potential must be Ecell = 0. In other words, once the system has balanced, no electrical work is available from the reaction, giving a cell potential of zero volts.

When a redox reaction in a cell reaches equilibrium, there is no net tendency for electrons to flow between the electrodes. The driving force for the reaction is zero. The link between Gibbs free energy and cell potential, ΔG = -nF Ecell, means that at equilibrium ΔG = 0, so the cell potential must be Ecell = 0. In other words, once the system has balanced, no electrical work is available from the reaction, giving a cell potential of zero volts.

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