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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.
Its assigned values include the ice point, the steam point and the melting point of antimony, gold and silver along with the boiling points of oxygen and sulfur. The International Practical Temperature Scale, first established in 1968, has 16 assigned values for calibration purposes, including the melting point of gold.