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Kasim Abdullah

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Also because most of the times the crude product is only treated with water, which does not dissolve all the impurities found in the substance or mixture you started with.
im not very sure about it...
One of the reasons that the crude product in most reactions is not pure is because the reaction is not complete and we have to do an additional step/steps of decolorization and crystallization to have a pure product that could be checked by its melting

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