Question

what is the use of common salt in soap industry?​

Answer 1

Answer:

Common salt is added to precipitate out all the soap from the aqueous solution. Adding of common salt to soap solution decreases the solubility of soap due to which all the soap precipitates out from the solution in the solid form

Answer 2

Explanation:

In soap manufacturing process, after the saponification reaction, soap is washed with concentrated brine solution (NaCl) to separate glycerin. Salt separates glycerol from water. Hence the "neat soap" is precipitated from the saponification solution by adding common salt.