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प्रश्न
Explain the cleansing action of soap. Draw diagrams to illustrate your answer.
उत्तर
Cleansing action of soap: Soap forms a colloidal suspension when dissolved in water. The soap molecules group together to form spherical micelles. When a soiled cloth is immersed in soap water, the hydrocarbon ends of the soap molecules in the micelles entrap the oil and grease on cloth's surface. The ionic ends of the soap molecules in the micelles (having negative charges) are attached to the water. As the soiled cloth gets agitated in the soap solution, the oil and grease entrapped by the soap micelles get dispersed into the water and the soap water becomes dirty while the cloth gets rid of the dirt and becomes clean. Cleansing of the cloth is then done by thoroughly rinsing it in clean water.
The following diagram illustrates the cleansing action of soap:
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संबंधित प्रश्न
Differentiate between Toilet soap and Laundry soap.
State one use of saponification process.
Which of the two is better for washing clothes when the water is hard: soap or detergent? Give reason for your answer.
In a soap micelle, the soap molecules are arranged radially with:
(a) ionic ends directed towards the centre and hydrocarbon ends directed outwards
(b) hydrocarbon ends directed towards the centre and ionic ends directed outwards
(c) both ionic ends and hydrocarbon ends directed toward the centre
(d) both hydrocarbon ends and ionic ends directed outwards
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.
Why are soaps not suitable for washing clothes when the water is hard?
Distinguish between esterification and saponification reactions of organic compounds.
Differentiate between:
Detergents and Soaps.
The saponification of a fat or oil is done using _____ solution for hot process.
______ molecules go and join with dirt and oil in the cloth.
