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प्रश्न
How will you check with the help of soap powder whether water is hard?
उत्तर
- In hard water (from a well or a tube well), soap does not foam but instead creates scum.
- As a result, soap loses its cleaning ability. So, using soap, we can determine that the water is hard.
संबंधित प्रश्न
Both soap and detergent are some type of salts. What is the difference between them?
A student took four test tubes P, Q, R and S and filled about 8 mL of distilled water in each. After that he dissolved an equal amount of Na2SO4 in P, K2SO4 in Q, CaSO4 in R and MgSO4 in S. On adding an equal amount of soap solution and shaking each test tube well, a good amount of lather will be obtained in the test tubes:
(a) P and Q
(b) P and R
(c) P, Q and S
(d) Q, R and S
Fill in the following blank with suitable word:
The sodium salt of a long chain fatty acid is called .............
Explain the process of preparation of soap in laboratory.
How is soap made? Write a word equation involved in soap making.
Why are soaps not suitable for washing clothes when the water is hard?
TFM in soaps represents ______ content in soap.
______ are substances which can undergo chemical changes to produce certain materials.
______ molecules go and join with dirt and oil in the cloth.
In the soap micelles
