Why does permanganate lose colourless with oxalic acid?
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Permanganate is a strong oxidising agent and hence just gets reduced in almost any conditions, i.e. acidic, basic or neutral. However, the degree of reduction it undergoes varies. In acidic medium it forms Mn2+ which is colourless. In strongly basic medium it forms MnO4 2- which has a green colour and in neutral and weakly basic medium it forms MnO2 which is brown coloured.
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Permanganate is a strong oxidising agent and hence just gets reduced in almost any conditions, i.e. acidic, basic or neutral. However, the degree of reduction it undergoes varies. In acidic medium it forms Mn2+ which is colourless. In strongly basic medium it forms MnO4 2- which has a green colour and in neutral and weakly basic medium it forms MnO2 which is brown coloured.
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oxalic acid decolorises potassium permanganate because they undergo a redox reaction, where both chemicals suffer both decomposition and change of oxidation state. So, the violet KMnO4 (potassium permanganate) suffer a change of the manganese from + 7 to +2.
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