Using standard electrode potentials, Zn2+/Zn = -0.76 V and Cu2+/Cu = +0.34 V, what is the standard cell potential of a Zn/Cu galvanic cell, and which metal is the anode?
Answer and explanation
Correct answer: B. 1.10 V, with zinc as the anode
- Step 1: The half-cell with the more negative potential is the anode, so zinc is oxidised.
- Step 2: E cell = E(cathode) - E(anode) = 0.34 - (-0.76) = 1.10 V.
Answer
1.10 V, zinc anode.
Why not the others: Copper is reduced, not oxidised; 0.42 V adds the potentials with the wrong sign.
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