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Question
Discuss briefly de-mineralisation of water by ion exchange resin.
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Solution
Demineralised water free from all soluble mineral salts is obtained by passing water successively through a cation exchange and an anion exchange resin.
In cation exchange process, \[\ce{H+}\] exchanges for \[\ce{Na+, Ca^{2+}, Mg^{2+}}\] and in the anion exchange process \[\ce{OH}\] exchanges for anions like \[\ce{CH, HCO3, SO2^{-}4}\], etc. \[\ce{H+}\] and \[\ce{OH-}\] released combine to form water.
\[\ce{H^{+} + OH- → H2O}\]
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