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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 melting point was not only the more practical of the. two; the melting point temperature is 3700 times less. dependent on the atmospheric pressure, and thus much. more reproducible. The choice of the melting point of ice. was the only acceptable choice for the standard temper-. ature for the meter at the time.