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When a solid is highly impure, this means that many different compounds are present apart from the solid, or that the compounds present are unknown. In order to perform recrystallisation, one needs to know what the impurities are or at least have an idea, since this technique involves choosing a solvent in which the solid wanted dissolves when the solvent is hot but recrystallizes back when the solvent is cold, while at the same time the impurities must dissolve in this solvent but remain dissolved in it. Therefore, unless the impurities are known or if there are many different impurities, a proper solvent cannot be chosen and recrystallization cannot occur

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