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Question

When zeolite, which is hydrated sodium aluminimum silicate is treated with hard water, the sodium iions are exchanged with which of the following ion(s)?
(a) H+ ions (b) Mg2+ ions (c) Ca2+ ions (d) SO24

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Solution

Answers: (b) Mg2+ ions (c) Ca2+ ions

To make hard water soft, zeolite method is used. Sodium zeolite or sodium alumino silicate (Na2Al2SiO3xH2O) is used it as a unique property of exchanging cation such as Ca2+ and Mg2+ in hard water for sodium ion.


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