Question

Which of the following methods is used for the removal of temporary hardness of water?

A

Treatment with washing soda

B

Calgon method

C

Ion-exchange method

D

Clark's method

Hard
Solution
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Correct option is D)


In Clark's process, slaked lime, is added to temporary hard water. Insoluble calcium carbonate precipitates out and no longer produce hardness.

Clark's process involves the addition of a controlled quantity of slaked lime (calcium hydroxide)


Β 


Slaked lime is itself a source of calcium ions (and hence hardness) so care must be taken to avoid adding an excess.

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