A galvanic cell operates under standard conditions according to the overall reaction…

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

Problem

A galvanic cell operates under standard conditions according to the overall reaction

I^{-}(\text{aq}) + ClO_{3}^{-}(\text{aq}) \to IO_{3}^{-}(\text{aq}) + Cl^{-}(\text{aq})

The measured standard cell potential at

25\,\text{°C}

0.89\,\text{V}

, and the standard molar Gibbs free-energy change is

\Delta G^\circ = -514\,\text{kJ}

. Faraday’s constant:

F = 9.65 \times 10^{4}\,\text{C mol}^{-1}

. (a) Determine the number of moles of electrons transferred in the balanced overall reaction. (b) Balance the redox reaction in acidic solution, showing all coefficients (including

H^{+}

H_{2}O

, and electrons) and verify that your balanced equation is consistent with the value of

n

obtained in part (a). (c) Explain why the large magnitude of

\Delta G^\circ

is consistent with the measured cell potential and the value of

n

you calculated.

Related theory

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