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How potassium permanganate is prepared f...

How potassium permanganate is prepared from `MnO_2. `

Text Solution

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Explanation
`2MnO_2 + 4KOH + O_2 to 2K_2MnO_4 +2H_2O`
`3MnO_4^(2-) +4H^(+) to 2MnO_4^(-) + MnO_2 + 2H_2O`
Detailed Answer :
(a) Preparation of `KMnO_4` : Potassium permanganate is pepared by the fusion of `MnO_2` with an alkali metal hydroxide in the presence of an oxidizing agent like `KNO_3`.It dark green `K_2MnO_4` which disproportionates ina neutral or acidic solution to give permanganate
(i) `2MnO_2 + 4KOH +O_2 overset(KNO_2)to 2K_2MnO_4 +2H_2O`
(ii) `3MnO_4^(2-) +4H^(+) to 2MnO_4^(-) + MnO_2 + 2H_2O`
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