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The experiment aims to clarify the meaning of purity in the chemical sense ; apply the method of recrystallization in the purification of a solid sample; recognize melting point as a physical property that can serve as an index of purity; determine the melting point of a substance using a simple apparatus; and compare the melting point of a pure versus impure sample of a substance.
Capillary melting points, either in an oil bath or a melting-point apparatus, are most often used for the. determination of the melting point of a solid. A few crystals of the compound are placed in a thinwalled. capillary tube 10-15 cm long, about 1 mm in inside diameter, and closed at one end. The capillary, which.