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The standard potential at pH=0 for the couples Fe2+/Fe and Fe3+/Fe2+ are -0.44V and 0.77V, respectively....

The standard potential at pH=0 for the couples Fe2+/Fe and Fe3+/Fe2+ are -0.44V and 0.77V, respectively. Should we expect Fe2+ to disproportionate in a deaerated acidic aqueous solution? Explain briefly

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Answer #1

reduction :

Fe+2 + 2e- ---------------------> Fe ,    Eo = -0.44 V

oxidation :

Fe+2 -------------------> Fe+3 + e-   , Eo = 0.77 V

overall reaction

3 Fe+2 ------------------> Fe + 2Fe+3

Eocell = Eo reduction - Eo oxidation

            = -0.44 - 0.77

         = -1.21

the overall cell potential is negative . so disproportionate reaction is not favors. we cannot expect this

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