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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.
Chemistry Assignment Help, Phase equilibria, Melting and freezing points: When a pure solid substance is heated through its melting point (melting temperature), the solid changes to a liquid. At the melting point equilibrium is established between the solid and liquid phases. Conversely, when a liquid is cooled through its freezing point or freezing temperature, the liquid is transformed to a solid, and at the freezing point, equilibrium is established so the melting and freezing temperatures of a pure substance are identical and in this case the terms can be used interchangeably.