When we add salt which is sodium chloride, it gets ionised in water and the sodium ions causes the sodium ions of soap to combine with the fatty acid ions and separate as solid soap. This helps in complete removal of soap from the reaction mixture. The precipitation of soap is through common ion effect.
faizan1161
Common salt is mainly added to the neat soap after the saponification 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.
Answers & Comments
When we add salt which is sodium chloride, it gets ionised in water and the sodium ions causes the sodium ions of soap to combine with the fatty acid ions and separate as solid soap. This helps in complete removal of soap from the reaction mixture. The precipitation of soap is through common ion effect.
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