Question

When zeolite (hydrated sodium aluminium silicate) is treated with hard water, sodium ions are exchanged with:

A

ions

B

ions

C

ions

D

ions

Medium
Updated on : 2022-09-05
Solution
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Correct option is B)

Hint:  Zeolites act as water softeners that remove mineral ions from them. 

Correct Answer:

Explanation :
In the question, we are given hydrated sodium aluminium silicate, which is a zeolite. 
Now it is asked that when sodium aluminium silicate is heated with hard water then sodium ions are exchanged by which ion.
The reaction between sodium aluminium silicate with hard water is as follows:



Here we can see that sodium ions are exchanged with ions. This removes the hardness of the water.
Hence, during the reaction of zeolite i.e. sodium aluminium silicate with hard water the sodium ion of zeolite, will be exchanged with calcium and magnesium ions.

So option   i.e. is correct.

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