Civil Engineering - Water Supply Engineering - Discussion

33. 

By boiling water, hardness can be removed if it is due to

[A]. calcium sulphate
[B]. magnesium sulphate
[C]. calcium nitrate
[D]. calcium bicarbonate
[E]. none of these.

Answer: Option D

Explanation:

No answer description available for this question.

Ashwani Suthar said: (Sep 9, 2015)  
Only temporary hardness can be removed by boiling of water which consists of carbonates and bicarbonates of Ca and Mg.

Shahin Vk said: (Apr 15, 2016)  
Lime treatment can remove CH caused by Ca and Mg and NCH caused by Mg.
Lime soda treatment can remove CH caused by Ca and Mg and NCH caused by Ca and Mg.
Ion exchange process can produce zero hardness water.

Benji said: (Mar 2, 2020)  
Boiling the water causes the precipitation of solid calcium carbonate or solid magnesium carbonate. This removes the calcium ions or magnesium ions from the water, and so removes the hardness. Therefore, hardness due to hydrogen carbonates is said to be temporary.

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