Question

what is the use of common salt in soap industry

Answer 1

Common salt is mainly added to the neat soap after the sponification reaction when the soap is washed with NaCl or brine solution in order to separate glycerin. It is mainly added for precipitation to separate it from the aqueous solution. Salt is also used in order to separate glycerol from the water.

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Answer 2

The saponification reaction is exothermic in nature, because heat is liberated during the process. The soap formed remains in suspension form in the mixture. Soap is precipitated as a solid from the suspension by adding common salt to the suspension. This process is called Salting out of Soap.
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