Why we heat oxalic acid?
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Oxalic acid is heated before titration with KMnO4 solution because this reaction happens only in certain temperature. If not heated your light pink titrated solution turns brown soon & reaction takes longer times but overheating will cause decomposition of oxalic acid as CO2.
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Explanation:All reactions require activation energy and the correct orientation. If you do not heat the mixture, the reactants won't have enough activation energy (in a short time) to start the reaction even they are in the correct orientation. However, if you heat, the heat energy gained by particles convert it to kinetic energy, so they move with higher speed. This results in higher frequency of collision among the particles, so, increased frequency of effective collision. Thus, rate of reaction increases and you will be able to obtain your results in a shorter time. ( Effective collision means success of reaction, i.e. products formed)
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