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Question

How will you obtain pure potassium permanganate (KMnO4) crystals from its ore, pyrolusite? Give the steps involved and the reactions.

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Solution

(KMnO4) Potassium permanganate is prepared from mineral pyrosulphite (MnO2)
(a) Conversion of Pyrosulphite ore (MnO2) to Potassium Magnate K2MnO4 :
MnO2+4KOH+O2Heat−−−−−−2K2MnO4+2H2O
(b) Oxidation of Potassium Magnate (K2MnO4) to potassium permanganate (KMnO4)
2K2MnO4+Cl22KCl+KMnO4

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