Q2 of 21 Page 18

What causes permanent hardness of water?

Permanent hardness of water is caused by the presence of chlorides and sulphates of calcium and magnesium. It can be removed by using and ion exchanger.


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1

AIM

To study of the similar cleaning capacity of a sample of soap in soft and hard water.

 1

Why can’t hard water be used for washing purposes?

 3

How can temporary hardness of water be removed?

 4

Out of water obtained from rain, pond, tap and hand pump, which one is best suited for cleaning purposes?