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How does impurities affect the boiling point of a liquid?

April 26, 2017affect boiling impurities liquid point

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How does impurities affect the boiling point of a liquid?

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Impurities affect surface tension appreciably. It is observed that impurities, which tend to concentrate on the surface of liquids, compared to its bulk lower the surface tension. Substances like detergents, soaps, alcohol lower the surface tension of water, while inorganic impurities present in the bulk of a liquid such as NaCl tend to increase the surface tension of water.