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Question

While studying saponification reaction for the preparation of soap, a teacher suggested to a student to add a small quantity of common salt to the reaction mixture. The function of common salt in this reaction is to

A

Reduce the alkalinity of the soap

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B

Reduce the acidity of the soap

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C

Enhance precipitation of soap

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D

Favour precipitation of soap

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Solution

The correct option is D
Favour precipitation of soap

Common salt is added in saponification reaction, as it helps in the precipitation of soap by decreasing the solubility of soap.

Hence, the correct option is D

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(a) To reduce the basic nature of the soap
(b) To make the soap neutral
(c) To enhance the cleansing power of the soap
(d) To favour the precipitation of the soap

Q. While preparing soap, a small quantity of common salt is generally added to the reaction mixture of vegetable oil and sodium hydroxide. Which one of the following may be the purpose of adding common salt?

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