The standard electrode potential for is and the standard electrode potential for is .

CHEMISTRY · Multi-part · A Level · Chemistry · Electrode potentials · Electrode potentials

Problem

The standard electrode potential for Zn2+(aq)+2e−⇌Zn(s)\text{Zn}^{2+}(\text{aq}) + 2\text{e}^- \rightleftharpoons \text{Zn}(\text{s}) is −0.76 V-0.76\text{ V} and the standard electrode potential for Pb2+(aq)+2e−⇌Pb(s)\text{Pb}^{2+}(\text{aq}) + 2\text{e}^- \rightleftharpoons \text{Pb}(\text{s}) is −0.13 V-0.13\text{ V} . (a) What does this tell you about the tendency of Zn2+\text{Zn}^{2+} ions to gain electrons compared to that of Pb2+\text{Pb}^{2+} ions? (b) Using your answer to part a, determine the reactions that will occur in each half-cell when the two half-cells are combined. (c) Deduce the overall redox equation. (d) State whether the zinc or lead electrode is the negative electrode.

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