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Question

Which of the following process permanent hardness of water can be removed, by adding

A
Sodalime
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B
Sodiumbicarbonate
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C
Washing soda
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D
Sodium chloride
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Solution

The correct option is C Washing soda
Washing soda removes both the temporary and permanent hardness by converting soluble calcium and magnesium compounds in to insoluble carbonates.

CaCl2+Na2CO3CaCO3+2NaCl

CaSO4+Na2CO3CaCO3+Na2SO4

Ca(HCO3)2+Na2CO3CaCO3+2NaHCO3

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