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Question:

What is meant by 'demineralised' water and how can it be obtained?

Answer:

Demineralised water is free from all soluble mineral salts. It does not contain any anions or cations.

Demineralised water is obtained by passing water successively through a cation exchange (in the H+ form) and an anion exchange (in the OH- form) resin.

During the cation exchange process, H+exchanges for Na+, Mg2+, Ca2+, and other cations present in water.

In the anion exchange process, OH- exchanges for anions such as CO2-3, SO2-4 , Cl- , HCO-3 etc. present in water.

OH- ions liberated in reaction (2) neutralize H+ ions liberated in reaction (1), thereby forming water.

H+ (aq)  +  OH- (aq)  →   H2O(l)


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