Question

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Why is a boiling point or melting point of a substance important?​

Answer 1

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Melting points are important because they indicate compound purity. If you synthesize a compound and measure its melting point and the melting point is well-defined (i.e., the compounds melts over a very small temperature range) and the temperature agrees with values reported in the literature (if those are available), then it is a strong piece of evidence that the sample is relatively pure. Boiling points are important for the same reason, a well-defined boiling point indicates purity. 

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Answer 2

Answer:

the boiling point is the temperature at which a substance changes from liquid to gaseous state. the melting point is the temperature at which a substance changes from solid to liquid (melts). so both are important for the change of the state of a substance.

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