A mixed melting point determination is occasionally used to identify a substance

Question

A mixed melting point determination is occasionally used to identify a substance. In this procedure, a compound of suspected identity is mixed with an authentic sample of the substance, and a melting point is taken using the apparatus. Say you know the melting point of is103-104 degrees Celsius. Describe the observed melting point range if (a) the suspected compound is in fact the same substance as the authentic sample. (b) the suspected compound is not the same substance as the authentic sample.

Explanation / Answer

if (a) the suspected compound is in fact the same substance as the authentic sample.

The observed melting point range will be same i.e 103-104 degree celsius.

(b) the suspected compound is not the same substance as the authentic sample.

The observed melting point range will be higher than 103-104 degree celsius if the suspected compound has higher melting point than the authentic sample.

The observed melting point range will be lower than 103-104 degree celsius if the suspected compound has lower melting point than the authentic sample.

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