What's the purpose of boiling and filtering potassium permangante solution?
Potassium permanganate often contains traces of insoluble MnO2. The presence of trace amounts of reducing agents in water can also produce some additional MnO2 when the KMnO4 is added to the water. The boiling speeds up the reaction of any reducing agents initially present in the solution so that your final solution will be fairly stable against further "decomposition" after preparation. The filtration is done primarily to get rid of this insoluble MnO2 from the final solution.
A well-prepared KMnO4 solution should last for several months with minimal decomposition if stored well.
The pourpose is to burn , oxidize, any carbon compound in it.
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