Question

Why is it necessary to wait until the next lab period to obtain the melting point of benzamide?​ This has to do with my Recrystallization of Benzamide Lab in Organic Chemistry Lab.

Answer 1

Water is a good solvent for recrystallizing benzamide because benzmide is a polar with hydrogen bonding . You Recrystallizing the benzmide in water and filtering it. The filteration will not leave all water molecules. Some of the Molecules will be present with benzamide which should be eliminated before checking melting point. Otherwise melting point will not appear proper manner. To vaporize the water molecules if you leave it for a day in open atmosphere all water molecules goes up. and you will only compound without water . If you check melting point after a day it wiil be accurate.