CHEM263 Lecture Notes - Lecture 1: Diethyl Ether, Ethyl Acetate, Dichloromethane
29 Dec 2018
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To identify the unknown solid within the crude sample using the recrystallization technique to first purify the sample, and then using a tlc to compare the purified unknown solid with the 5 possibilities. Flammable, irritant: fill tiny beakers with a small amount of each present solvent (room temperature), and add some crude mixture. For the solvents in which the crude doesn"t dissolve, heat them over a steam bath. Whichever heated solvent dissolves the crude represents the best solvent for recrystallization. Recrystallization: record the weight of the crude mixture, and add it to an erlenmeyer flask. Then continue to cool it in an ice bath, along with your solvent: after completely cooling the mixture, use vacuum filtration to separate the crystals from the supernatant. Make sure to rinse the crystals with ice cold solvent to rid them of any remaining impurities.
