Question

When zeolite is treated with hard water the sodium ion are exchanged with:

A

B

C

D

Medium
Solution
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Correct option is B)

When hard water passes through the zeolite, the hardening compounds of calcium and magnesium are caught up by the zeolite and become compounds of sodium. Since sodium salts in water do not precipitate out on heating or form soap curds the water is called 'soft'.

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