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Potassium PermanganateD & F Block

How is green manganate converted to permanganate in the lab?.

Expert Answer

Disproportionation in acidic/neutral medium: 3MnO42+4H+2MnO4+MnO2+2H2O3MnO_4^{2-} + 4H^+ \rightarrow 2MnO_4^- + MnO_2 + 2H_2O.

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