Zeolite purified water is not de-ionised. Explain giving reasons.

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Solution

There is exchange of Ca²⁺Or Mg²⁺ions with Na⁺ions present in sodium complex called permutit Na₂Al₂Si₂O₈(also called zeolite)
$N a_{2} A l_{2} S i_{2} O_{8} + C a C l_{2} \to C a (A l_{2} S i_{2} O_{8})_{2} + 2 N a C l$
Permutite can be obtained back by treating with NaCl.
$C a (A l_{2} S i_{2} O_{8})_{2} + 2 N a C l \to N a_{2} A l_{2} S i_{2} O_{8} + C a C l_{2}$

This is also called ion exchange method. Here the water coming out as per the first process has ions Cl^-. So its not de-ionised.

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