What is an azeotrope? A student performs two melting point determinations on a c

Question

What is an azeotrope? A student performs two melting point determinations on a crystalline product. In one determination, the capillary tube contains a sample of 1-2 mm in height and the melting range is found to be 121-122 degree C. In the other determination, the sample height is 4-5 mm and the melting range is 121-125 degree C. Explain the broader melting point range observed for the second sample. The reported melting point for the compound is 123 degree C. When 2-propanol was used as the developing solvent, two substances moved with the solvent front (R_f = 1) during thin layer chromatography (TLC) analysis on a silica gel plate. Can you conclude that the two substances are identical? If not, what additional experiment (s) would you perform?

Explanation / Answer

Q12.

an azeotrope is a mixture of two or more liquids in which their composition will not allow them to separate via simple distillaton, i.e. both (or all compontents) will have the same vpaorization value, therefore impossible to separate.

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