Q. 16

Which of the following compounds is used for water softening?
A. Ca3 (PO4)2

B. Na3PO4

C. Na6P6O18

D. Na2HPO4

Answer :

Permanent hardness cannot be removed only by simple boiling. One method of removing permanent harness is by Calgon’s method.

Here, calgon, which is sodium hexametaphosphate(Na6P6O18), when added to hard water following reactions take place :

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