Question

Soft Soaps are:
A.Sodium salts of fatty acids
B.Potassium salts of fatty acids, containing excess of free alkali.
C.Potassium salts of fatty acids, containing no free alkali.
D.Calcium salts of fatty acids.

Answer 1

Hint:We know that soaps are of sodium/potassium salt of several combinations of fatty acids as well as have cleansing action in a combination with water. They consist of several fats along with oil. The example of a soap includes sodium oleate, sodium stearate, and sodium palmitate, etc.

Complete step-by-step answer: Also both fat as well as oil is needed to make soap along with that they are extracted from animals as well as plants. For making fatty acid molecules like those of the triglyceride, three molecules of a fatty acid get added to $1$ molecules of a glycerine. These fatty acids are weak as well as it consists of two different parts. From that one is a carboxylic group which consists of $1$ hydrogen atom, by two oxygen atoms as well as $1$ carbon atom. The other is a hydrocarbon chain which is attached to a carboxylic acid group.
Generally, soap is created from a long chain of carbon atoms carrying two hydrogen atoms, alkali which was needed to make soap is derived from animals, but today it is clinically composed. The common alkali used to make soap is sodium hydroxide, which is commonly called caustic soda as well as potassium hydroxide which is commonly called as a caustic potash. The manufacturing process of soap consists of following different methods.

Therefore, Option C is correct option i.e. Potassium salt of fatty acid, containing no free alkali is called soft soap.

Note:The most common method used to make soap is known as the saponification. The greater number of fat as well as soil get heated up as well as then mixed to liquid alkali for producing soap along with water with little glycerine. Soap is sodium/potassium salt of fatty acids that is soluble in the water. They are made of oil as well as fats/fatty. Soaps react along with mineral salt as well as form an insoluble precipitate which is also called scum/soap film.