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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 of a substance is the (thermal) point at which a solid substance gains enough thermal energy to become a liquid. The boiling point of a substance is the (t â¦ hermal) point at which a liquid substance gains enough thermal energy to become a gas.he melting point is the temperature at which a substance changes states between liquid and solid-can also be known as the freezing point or point of solidification.