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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 mixed melting point technique is an important reason why all high-quality melting point instruments accommodate at least three capillaries in their heating blocks. In its most common implementation, three melting points are determined: (1) sample, (2) reference and (3) reference and sample in a 1:1 mixing ratio.