Impurities may bring about incompatibility with other substances. Impurities may lower the shelf life of the substances. Impurities may cause difficulties during formulations and use of the substances. Sometimes Impurities change the physical and chemical properties of the substances. Impurities present in a solid organic compound tend to have 2 effects on the melting point. First, they tend to lower the overall melting point of the compound versus the value for pure material. Second, they tend to increase the range of the melting point values.
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