Answer to Question #259215 in Organic Chemistry for Mike

Question

Q/Record the melting point ranges of the pure and impure samples and include a description of the melting process in each case. Research the theoretical melting point of aspirin and the salicylic acid and record. Account for any difference between the melting points of crude and recrystallised samples of aspirin? with description and explanations, where:

Crude melting point = 148-151℃

Recrystallized melting point = 124-131℃

Aspirin melting point= 135℃

salicylic acid melting point= 211℃

Answer 1

Determining the melting point of a compound is one way to test if the substance is pure. Impurities tend to depress and broaden the melting range so the purified sample should have a higher and smaller melting range than the original, impure sample.