Q1 of 21 Page 18

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

Hard water cannot be used for washing and cleaning because a large amount of soap gets washed away due to the formation of scum. Apart form this, it also sticks to the fibres of clothes.


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1

AIM

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

 2

What causes permanent hardness of water?

 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?