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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 transition between the solid and the liquid is so sharp for small samples of a pure substance that melting points can be measured to $\mathrm{0.1^oC}$. The melting point of solid oxygen, for example, is $\mathrm{-218.4^oC}$.