Past exam of the chemistry course of the year 1 of the natural sciences course of the University of Cambridge / 2021 / Paper 1 / 4 / c

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- Solution c

Solution

Measure the reversible cell potential at several temperatures while maintaining standard-state thermodynamic activities and the same phases. From

Δ_{r} G^{\circ} = - n F E^{\circ}

and

Δ_{r} S^{\circ} = - (\partial Δ_{r} G^{\circ} / \partial T)_{p}

,

Δ_{r} S^{\circ} = n F (\frac{\partial E ^{\circ}}{\partial T})_{p} .

The sign of the slope gives the sign of the standard reaction entropy. Measuring a loaded cell voltage without correcting polarization would not give this reversible thermodynamic derivative.

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