How to calculate the oxidation number of Iron in ferric ferrocyanide Fe4[Fe(CN)6]3?

  1. Oxidation state of outer Fe

    The dissociation of Fe4[Fe(CN)6]3 can be written as

    Fe4[Fe(CN)6]3 → 4 Fe3+ + 3 [Fe(CN)6]4-

    Hence, the oxidation state of outer Fe is +3

  2. Oxidation State of inner Fe

    Let the oxidation number of Fe be X

    Here oxidation number on CN = -1

    For [Fe(CN)6]4-

    X × 6 (-1) = -4

    ∴ X = +2, the oxidation state of inner Fe.

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