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In the laboratory of a school , the sample of hard water is not available " to study the comparative cleaning capacity of a sample of soap in soft and hard water". Which salt from the laboratory can be added to tap water to make it hard ? In the experiment how is cleaning capacity of soap compared ?
How will you distinguish : between soft water and hard water.
Assertion : Soft and hard X -rays differ in frequency as well as velocity. Reason : The penetrating power of hard X - rays is more than the penetrating power of soft X -rays.
State the disadvantages of using hard water.
Which of the following is not a disadvantage of using hard water?
Assertion : Soft water lathers with soap but not hard water. Reason : Hard water reacts with soap to form insoluble salts which form scum, not lather.
a. Water extinguishes most fires, but it does not extinguish petrol fires. Explain. b. Soft water lathers with soap, but not hard water. Why?
Differentiate between Soft wood and hard wood
Hardness of water is estimated by simple complex formation titration Complex formed by cation in hard water during estimation of hardness is .
Define hard water.
ICSE-WATER -EXERCISES (G-DIFFERENTIATE BETWEEN THE FOLLOWING)
