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प्रश्न
How soap is prepared?
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उत्तर
Soaps are formed by heating fat or oil (i.e. glyceryl esters of fatty acids) with aqueous sodium hydroxide solution. This reaction is called saponification.
During the process of hydrolysis esters of fatty acids are hydrolyzed and the soap is obtained in the colloidal form. It floats in solution as curd. It is precipited from the solution by adding sodium chloride.
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संबंधित प्रश्न
Explain cationic detergents.
What is a soap ?
Following type of nom-ionic detergents are present in liquid detergents, emulsifying agents and wetting agents. Label the hydrophilic and hydrophobic parts in the molecule. Identify the functional group (s) present in the molecule.
Why do soaps not work in hard water?
Can you use soaps and synthetic detergents to check the hardness of water?
Explain the cleansing action of soaps.
Explain the mechanism of cleansing action of soaps.
Write balanced chemical equations for the action of hydrogen bromide on styrene in the presence of a peroxide
Write balanced chemical equations for the action of methyl bromide on silver propanoate
Which of the following enhances leathering property of soap?
Glycerol is added to soap. It functions ______.
If soap has high alkali content it irritates skin. How can the amount of excess alkali be determined? What can be the source of excess alkali?
Why is it safer to use soap from the environmental point of view?
What is the side product of soap industry? Give reactions showing soap formation.
What is the difference between bathing soap and washing soaps?
What are fillers and what role these fillers play in soap?
Match the soaps given in Column I with items given in Column II.
| Column I | Column II |
| (i) Soap chips | (a) dried miniature soap bubbles |
| (ii) Soap granules | (b) small broken pieces of soap formed from melted soaps |
| (iii) Soap powder | (c) soap powder + abrasives + builders \[\ce{(Na2CO3,Na3PO4)}\] |
| (iv) Scouring soap | (d) soap powder + builders like \[\ce{Na2CO3}\] and \[\ce{Na3PO4}\] |
Assertion: Sodium chloride is added to precipitate soap after saponification.
Reason: Hydrolysis of esters of long-chain fatty acids by alkali produces soap in colloidal form.
Which of the following is not a correct statement?
Green chemistry in day-to-day life is in the use of ______.
Self-cleansing windows are example of the ______.
