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The method used to remove temporary hard...

The method used to remove temporary hardness of water is

A

synthetic resins method

B

Calgon's method

C

Clark's method

D

ion-exchange method.

Text Solution

Verified by Experts

The correct Answer is:
C
Clark.s method is used to remove temporary hardness of water. In this method quick lime is added. The bicarbonates present in temporary hard water react with lime to form insoluble calcium and magnesium carbonates which can be easily filtered off.
`underset("Quick lime")(CaO)+H_(2)Otounderset("Lime water")(Ca(OH)_(2))`
`Ca(HCO_(3))_(2)+Ca(OH)_(2)to2CaCO_(3)darr+2H_(2)O`
`Mg(HCO_(3))_(2)+2Ca(OH)_(2)to2CaCO_(3)darr+Mg(OH)_(2)+2H_(2)O`
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