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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.
Digital thermometers. If the digital thermometer is used over a narrow temperature range (e.g., â50 Â°C to 100 Â°C), a single-point check at the ice melting point (0 Â°C) or at an ambient temperature is a sufficient method of performance verification.