Q. 25

In the following question two or more options may be correct.

When Zeolite, which is hydrated sodium aluminium silicate is treated with hard water, the sodium ions are exchanged with which of the following ion(s)?

A. H+ ions

B. Mg2+ ions

C. Ca2+ ions

D. SO42- ions

Answer :

Zeolite is hydrated sodium aluminium silicate, or Al2Si2O8. Hard water consists mainly of calcium and magnesium salts, hence sodium ions are exchanged with mainly Mg2+ and Ca2+ ions. The reaction is given as

Na2Z + M2+ MZ + 2Na+


Where M is Mg2+ or Ca2+ and Z is Zeolite.

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