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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.
In the first part, you will. determine the melting point range of three known compounds. This part is. mostly for practice, to make sure you know how to use the Mel-Temp. apparatus to obtain melting point ranges that are close to the literature values. (that is, the values in this manual) of fairly pure samples. In the second part, you will determine the melting point range of an. unknown compound and tentatively identify the compound. In the last part, you will confirm the identity of your unknown by doing. what is known as a mixed melting point determination. Your instructor may.