9.26  What is meant by ‘demineralised’ water and how can it be obtained?

Answers (1)

Demineralized water means free from all types of cations and anions and also soluble mineral salts.

It can be obtained by passing water successively through a cation exchange (in the H^{+} ion form) and anion exchange (in the form of OH^{-}ion) resins:

Cation exchange process- 

2RH(s)+M^{2+}\rightleftharpoons MR_{2}(s)+2H^{+}(aq)   {  exchange for Na^{+}, Ca^{2+},Mg{2+} and other cation present in water.}

Anion exchange process-

OH^{-}  exchanges for anions like Cl^{-},HCO_{3}^{-},SO_{4}^{2-} etc present in the water    \\RNH_{2}(s)+H_{2}O(l)\rightleftharpoons RNH_{3}^{+}.OH^{-}(s)\\RNH_{3}^{+}.OH^{-}(s)+X^{-}(aq)\rightleftharpoons RNH_{3}^{+}X^{-}(s)+OH^{-}(aq)

OH^{-} ions liberated in anion exchange neutralizes the  H^{+} ions liberated in cation exchange, thereby forming water

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