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प्रश्न
Why is common salt (sodium chloride) added during the preparation of soap?
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उत्तर
Common salt (sodium hydroxide) is added during the preparation of soap to separate the soap from the aqueous solution. On adding common salt, the solubility of the soap present in the solution decreases. This allows the soap to be taken out of the solution in its solid form.
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संबंधित प्रश्न
Differentiate between Toilet soap and Laundry soap.
Both soap and detergent are some type of salts. What is the difference between them?
Why do soaps not form lather in hard water?
A student takes four test tubes marked P, Q, R and S of 25 mL capacity and fills 10 mL of distilled water in each. He dissolves one spoon full of four different salts in each as − KCl in P, NaCl in Q, CaCl2 in R and MgCl2 in S. He then adds about 2 mL of a sample of soap solution to each of the above test tubes. On shaking the contents of each of the test tubes, he is likely to observe a good amount of lather (foam) in the test tubes marked
(a) P and Q
(b) R and S
(c) P, Q and R
(d) P, Q and S
Would you be able to check if water is hard by using a detergent?
Mention the essential material (chemicals) to prepare soap in the laboratory. Describe in brief the test of determining the nature (acidic/alkaline) of the reaction mixture of saponification reaction.
Explain the process of preparation of soap in laboratory.
Why have detergents replaced soap as a washing agent?
Give any two differences between soaps and detergents.
Describe the structure of a soap molecule with the help of a diagram.
The chemical which is not required for the preparation of soap in the laboratory is:
(a) vegetable oil
(b) baking soda
(c) caustic soda
(d) common salt
Explain the action of soap in removing an oily spot from a piece of cloth.
Distinguish between esterification and saponification reactions of organic compounds.
What is the difference between soaps and detergents? State, in brief, the cleansing action of soaps in removing an oily spot from a fabric. Why are soaps not very effective when a fabric is washed in hard water? How is this problem resolved?
Explain why soap cannot be used in hard water.
Explain why synthetic detergents are superior to soap.
What are the three main constituents of soap?
Soaps are ester of which type of acids?
