Question

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

Answer 1

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 OH– ions liberated in reaction (2) neutralize H+ ions liberated in reaction (1), thereby forming water. Read more on Sarthaks.com - https://www.sarthaks.com/8931/what-is-meant-by-demineralised-water-and-how-can-it-be-obtained.

H^+ + OH^-=H2O