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प्रश्न
What are the differences between Soap and synthetic detergent?
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उत्तर
| Soap | Synthetic detergent | |
| 1. | Soaps are sodium salts of fatty acids (hard soap) or potassium salts of fatty acids (soft soap). | Synthetic detergents are made from raw materials such as fats or kerosene. |
| 2. | They can be used only with soft water. | They can be used with both soft and hard water. |
संबंधित प्रश्न
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
While studying the saponification reaction, what do you observe when you mix an equal amount of colourless vegetable oil and 20% aqueous solution of NaOH in a beaker?
(A) The colour of the mixture has become dark brown
(B) A brisk effervescence is taking place in the beaker
(C) The outer surface of the beaker has become hot
(D) The outer surface of the beaker has become cold
What are the raw materials required for making soap in a laboratory (or at home)?
The sodium salt of a long chain fatty acid is called ______.
Explain the process of preparation of soap in laboratory.
Why is soap not suitable for washing clothes when the water is hard?
What are detergents chemically? List two merits and two demerits of using detergents for cleansing. State the reason for the suitability of detergents for washing, event in the case of water having calcium and magnesium ions.
Give a scientific explanation.
Soap forms a precipitate in hard water.
______ molecules go and join with dirt and oil in the cloth.
