Take about 20 ml of castor oil in a beaker. Add 30 ml of 20% sodium hy

1.	Take about 20 ml of castor oil in a beaker. Add 30 ml of 20% sodium hydroxide solution. Heat the mixture with continuous stirring for a few minutes till the mixture thickens. Add 5–10 g of common salt to this. Stir the mixture well, allow it to cool, soaps is obtained. (a) Why do we use common salt to make soap? (b) What will happen if you will add the above made soap solutions to the following test tubes A, B, and C. (c) Can we use potassium hydroxide instead of sodium hydroxide.
Answer» (a) Salt: NaCl is added while making soap, because it will help the reaction to occur faster and adds sodium ion to increase the reaction rate. (b) In test tube A: Soap + Oil ⎯→ Lather/foam is formed. Carboxylic chain dissolves in oil. In test tube B: Soap + Hard water ⎯→ Insoluble compound called scum is formed. In test tube C: Soap + soft water ⎯→ Froth is formed. (c) Yes, we can use potassium hydroxide to prepare soap

Take about 20 ml of castor oil in a beaker. Add 30 ml of 20% sodium hydroxide solution. Heat the mixture with continuous stirring for a few minutes till the mixture thickens. Add 5–10 g of common salt to this. Stir the mixture well, allow it to cool, soaps is obtained. (a) Why do we use common salt to make soap? (b) What will happen if you will add the above made soap solutions to the following test tubes A, B, and C. (c) Can we use potassium hydroxide instead of sodium hydroxide.

Answer»

(a) Salt: NaCl is added while making soap, because it will help the reaction to occur faster and adds sodium ion to increase the reaction rate.

(b) In test tube A: Soap + Oil ⎯→ Lather/foam is formed. Carboxylic chain dissolves in oil.

In test tube B: Soap + Hard water ⎯→ Insoluble compound called scum is formed.

In test tube C: Soap + soft water ⎯→ Froth is formed.