The values for two low-spin iron complexes in acidic solution are as follows:(a) Is it

Chapter 24, Problem 23.93

(choose chapter or problem)

The \(E^{\circ}\) values for two low-spin iron complexes in acidic solution are as follows:

\(\begin{aligned} {\left[\mathrm{Fe}(o-\text { phen })_3\right]^{3+}(a q)+\mathrm{e}^{-} } & \rightleftharpoons\left[\mathrm{Fe}(o-\mathrm{phen})_3\right]^{2+}(a q) &      \\E^{\circ} &=1.12 \mathrm{~V} \\  {\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}(a q)+\mathrm{e}^{-} \rightleftharpoons\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{4-}(a q) } &      \\E^{\circ} &=0.36 \mathrm{~V} \end{aligned}\)

(a) Is it thermodynamically favorable to reduce both Fe(III) complexes to their Fe(II) analogs? Explain.

(b) Which complex, \(\left[\mathrm{Fe}(o-\mathrm{phen})_3\right]^{3+}\) or \(\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}\), is more difficult to reduce?

(c) Suggest an explanation for your answer to (b).

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