What is the formula of ferric ferrocyanide?

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Question

(A) Ferric ferrocyanide is commonly known as Prussian blue. In this compound,the iron in the coordination sphere is in the $+2$ oxidation state (ferro

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$Fe_4[Fe(CN)_6]_3$

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(A) Ferric ferrocyanide is commonly known as Prussian blue. In this compound,the iron in the coordination sphere is in the $+2$ oxidation state (ferrocyanide,$[Fe(CN)_6]^{4-}$),and the iron outside the coordination sphere is in the $+3$ oxidation state (ferric,$Fe^{3+}$). To balance the charges,we need four $Fe^{3+}$ ions for every three $[Fe(CN)_6]^{4-}$ ions. Thus,the formula is $Fe_4[Fe(CN)_6]_3$.

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