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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.
This is an important property. of solids. The melting point of solids, like the boiling point of liquids, is often used for the identification of. substances. The normal melting point of a solid is defined as the temperature at which the solid and liquid. phases of a solid are in equilibrium at a total pressure of 1atm.