The formal potential of Fe^{3+}/Fe^{2+} in a | vedclass

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(A) The standard reduction potential of $Fe^{3+}/Fe^{2+}$ is $+0.77 \ V$. In a mixture of $H_{2}SO_{4}$ and $H_{3}PO_{4}$, $Fe^{3+}$ ions react with p

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formation of the species $[FeHPO_{4}]^{+}$

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(A) The standard reduction potential of $Fe^{3+}/Fe^{2+}$ is $+0.77 \ V$. In a mixture of $H_{2}SO_{4}$ and $H_{3}PO_{4}$, $Fe^{3+}$ ions react with phosphate ions to form a stable complex, $[FeHPO_{4}]^{+}$. According to the Nernst equation, $E = E^{\circ} - (0.059/n) \log(1/[Fe^{3+}])$. As the concentration of free $Fe^{3+}$ ions decreases due to complex formation, the reduction potential decreases from $+0.77 \ V$ to $+0.61 \ V$.

The formal potential of $Fe^{3+}/Fe^{2+}$ in a sulphuric acid and phosphoric acid mixture $(E^{\circ}=+0.61 \ V)$ is much lower than the standard potential $(E^{\circ}=+0.77 \ V)$. This is due to

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