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प्रश्न
Give a scientific explanation.
Soap forms a precipitate in hard water.
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उत्तर
When soap is mixed with hard water calcium and magnesium salts of fatty acids are formed. These being water insoluble they form a precipitate and that is why lather is not formed.
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संबंधित प्रश्न
Both soap and detergent are some type of salts. What is the difference between them?
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
Why does micelle formation take place when soap is added to water? Will a micelle be formed in other solvents such as ethanol also?
Distinguish between esterfication and saponification reaction with the help of the chemical equations for each.
State one use of esterfication process.
State one use of saponification process.
Explain esterification reaction with the help of a chemical equation. Describe an activity to show esterification.
What is a detergent?
What is the advantage of detergents over soaps for washing clothes?
The chemical mostly used in the preparation of most of the soaps we use is
(a) Sodium chloride
(b) Potassium hydroxide
(c) Sodium hydroxide
(a) Potassium chloride
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.
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?
Name three chemicals responsible for the surface activity of various detergents.
What are the differences between Soap and synthetic detergent?
Arrange the following statements in correct sequence
- Pour that solution into an empty matchbox, soap can be obtained after drying.
- Take the necessary quantity of water in a jar.
- Then add coconut oil drop by drop and stir it well.
- Add concentrated sodium hydroxide in the jar and allow it to cool.
- Try this soap to wash your hand kerchief.
- Cover your work area with old newspaper.
We are using ______ to remove strong stains on the clothes.
