Answer to Question #41825 in Inorganic Chemistry for Alan Alexander

Question

Write a report based on the notes given below.

0.10g glycine and 0.4ml water taken in 5ml conical vessel. Warmed slightly to dissolve the glycine. 0.3ml acetic anhydride added and stirred about 5 minutes. Mixture cooled in the ice bath for 10 minutes. Precipitate collected by suction filtration and washed with a few ml of water. Crystals spread over a piece of filter paper or watch glass and air dried for 10 minutes.
Glycine dissolved after 20 seconds when warmed in glycine water mixture.
White needle-shaped crystals formed when reaction mixture cooled in ice.
0.14gm of solid obtained after filtration and drying of product.
Mp of crystals recorded as 205-207.
Solid product possible still slightly wet.

Conclusion: Crystallized material was in fact acetamilide based on its melting point. Not highly pure. A second crystallization should produce a fairly pure material. But it would also decrease % recovery.

Answer 1

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