Question

Describe the method for the preparation of acetone in laboratory and give the chemical equation with labelled diagram?

Answer 1

In laboratory, acetone is prepared by dry distillation of anhydrous calcium acetate.
$(C{H}_{3}COO{)}_{2}Ca\stackrel{\Delta }{\to }C{H}_{3}COC{H}_3+CaC{O}_3$
Method: 30-40 gm of calcium acetate mixed with equal amount of sodium acetate is heated in a glass retort fitted with a condenser and receiver. Acetone is collected in the receiver. The acetone so obtained is not pure. To purify this, it is shaken with saturated solution of sodium bisulphite then crystals of acetone sodium bisulphite salt separated out. The crystalis washed and heated with sodium carbonate and then dried over anhydrous $CaC{l}_2$ and then distilled at 56${}^o$C to get pure acetone.