The stoichiometry between permanganate and cyanide ions in aqueous solution has been investigated. The reaction leading to the formation of a dark brown precipitate is represented by the equation 2MnO4- + 3CN- + H2O = 2MnO2 + 3OCN- + 2OH- Interaction of excess of ice-cooled 3M aqueous potassium cyanide and 0.1M aqueous potassium permanganate, initially produces and unstable manganese (IV) cyano species wich is finally reduced to manganese (III) giving heptapotassium- u-Oxo-bis [pentacyanomanganate(III)] cyanide. The oxo bridged [Mn2O(CN)10]6- ion appears to exist in solution.
A M QURESHI ,S A SUBAIRI ,
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