p-Block elementsHard
Question
When zeolite, which is hydrated sodium aluminium silicate, is treated with hard water, the sodium ions are exchanged with :
Options
A.H+ ions
B.Ca2+ ions
C.SO42- ions
D.Mg2+ ions
Solution
Ca2+ and Mg2+ are responsible for hardness of water. They are exchanged by Na+ of zeolites.
Na2 - Z + Ca2+ → 2Na+ + Ca - Z
Na2 - Z + Ca2+ → 2Na+ + Ca - Z
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