While preparing soap a small quantity of common salt is generally added to the r e action mixture of vegetable oil and sodium hydroxide Which one of the following may be the purpose of adding common salt CBSE class10 Science 2015

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. While preparing soap a small quantity of common salt is generally added to the r e action mixture of vegetable oil and sodium hydroxide. Which one of the following may be the purpose of adding common salt? CBSE- class10- Science 2015

(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


By:Fututron

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Answer:- (D)To favour the precipitation of the soap
Calcium, magnesium, and iron salts of fatty acids are insoluble and precipitate, thus leading to the main disadvantage of soap. So-called "hard water" contains appreciable quantities of one or more of these three ions.


milan-ransingh

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