Describe the preparation of crystaline KMnO4 from pyrolusite ore(MnO2) and give the equation for the chemical reaction involved.
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Preparation of potassium permanganate: Potassium permanganate is prepared by the fusion of MnO2 (pyrolusite) with potassium hydroxide and an oxidizing agent like KNO3 to form potassium manganate (green mass), which disproportionate in a neutral or acidic solution to form permanganate.
Mno2 + Koh + o2 + heat ----> K2Mno4+ H2O
K2Mno4+ Hcl ----->KMno4+Mno2 +kcl +h2o
unbalanced.
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