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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.
The boiling point of a substance is a. physical property of a substance and can be useful for characterizing that substance. The process of heating. a substance until it vaporizes, cooling the vapors, and collecting the condensed liquid is the basis of a. commonly used purification technique called distillation.