Q3 of 21 Page 18

How can temporary hardness of water be removed?

Temporary harness of water is caused by the presence of calcium and magnesium bicarbonates in water. It can be removed by boiling or adding sodium carbonate to hard water.


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1

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

 2

What causes permanent hardness of water?

 4

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

 5

State the reason for deposition of white scale in the interior of boilers after prolong use?