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At \( 25^{\circ} \mathrm{C} \) the value of \( \mathrm{K} \) for the equilibrium \( \mathrm{Fe}^{3+}+\mathrm{Ag} \rightleftharpoons \mathrm{Fe}^{2+}+\mathrm{Ag}^{+} \)is \( 0.531 \mathrm{~mol} / \) litre. The standard electrode potential for \( \mathrm{Ag}^{+}+\mathrm{e}^{-} \rightarrow \mathrm{Ag} \) is \( 0.799 \mathrm{~V} \). What is the standard potential for \( \mathrm{Fe}^{3+}+ \) \( \mathrm{e}^{-} \rightleftharpoons \mathrm{Fe}^{2+} \) ?
[given: \( \log _{10} 0.531=-0.2749 \) ]
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