For the cell Pt|Fe|Fe2+||Fe2+, Fe3+|Pt, one finds (/T)p = 1.14 mV/K at 25oC. (i)

Question

For the cell Pt|Fe|Fe2+||Fe2+, Fe3+|Pt, one finds (/T)p = 1.14 mV/K at 25oC. (i) Write the cell reaction using the smallest whole numbers as the stoichiometric coefficients. (ii) With the aid of appropriate standard reduction potentials, calculate So, Go and Ho for the cell reaction at 25oC. (iii) If the concentrations of the Fe2+ solutions are both 0.15 M and the [Fe3+] is 0.125, find the value of the potential of the cell. (iv) What is the value of K for the cell reaction at 25oC? (v) What is the value of K of the cell reaction at 75oC?

Explanation / Answer

The cell reaction will be

Fe2+(aq)Fe3+(aq)+e

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