Although the term \"melting point\" is used to describe a solid/ liquid change,

Question

Although the term "melting point" is used to describe a solid/ liquid change, we generally list melting ranges rather than single melting point. For most pure substances, the range is narrow (about 1-3 C) and is indicative of a substances purity. The two lab groups observed the melting ranges of vanillin obtained though a chemical reaction. From the following data, whose vanillin is more pure? Group A or Group B? Explain.

Groups                                   Observed Melting point range (C)

Pure Vanillin                                            81-83 C

Group A                                                     79-81 C

Group B                                                     80-86 C

Explanation / Answer

group B

as it is more probable

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