In a galvanic cell with zinc and copper electrodes, what reaction occurs at the copper cathode?
Answer and explanation
Correct answer: D.
- Step 1: In a galvanic cell, reduction always occurs at the cathode.
- Step 2: Copper has a higher reduction potential () than zinc ().
- Step 3: Therefore, copper ions in solution gain electrons and deposit as copper metal: .
Answer
\text{Cu}^{2+} + 2e^- \to \text{Cu}.
Why not the others: '' is the oxidation reaction occurring at the zinc anode; '' is copper oxidation; '' would be zinc reduction.
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