My lab notes of making potassium permanganate.
First i tried reacting manganese hydroxide, potassium chlorate and potassium hydroxide by mixing them together and heating to 300 celsius. I got green stuff that i think was potassium manganate so i oxidized it further to permanganate using chlorine gas. It turned the proper purple color but when i crystallized it the result was crystals of potassium chlorate with a little permanganate mixed in.
So that was failure and i repeated the experiment again at 400 celsius thinking i just needed more heat. But it still failed and produced only small quantites of permanganate.
So i thought maybe using manganese hydroxide was wrong. I repeated the experiment but using manganese dioxide this time. I produced a much more intense color of green manganate and purple permanganate and when i crystalized it i produced the proper black crystals of potassium permanganate. To make certain it was correct, i titrated using sodium oxalate and confirmed that i had a redox active substance that assayed to 99% purity. The yield was 15.4g or about 19%.
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