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CBSE Class 10 Answered

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Asked by sweetynam | 18 Feb, 2009, 03:22: PM
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Once the saponification reaction is complete, sodium chloride is added to precipitate the soap. The water layer is drawn off the top of the mixture and the glycerol is recovered using vacuum distillation.

The crude soap obtained from the saponification reaction contains sodium chloride, sodium hydroxide, and glycerol. These impurities are removed by boiling the crude soap curds in water and re-precipitating the soap with salt.

Answered by | 19 Feb, 2009, 01:21: AM
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