Question 9.26 What is meant by ‘demineralised’ water and how can it be obtained?
Class XI Hydrogen Page 290
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water which is free of all soluble mineral salts is called demineralized water.
demineralized water is obtained by passing water successively through a cation exchange and an anion exchange resins.
in cation exchanger, Ca² ⁺, Mg²⁺,Na⁺ and other present cation in water are removed by exchanging with H⁺ ions while in anion exchanger, Cl⁻,HCO₃⁻,SO₄²⁻ etc, present in water are removed by exchanging them with OH⁻ ions
H⁺ + OH⁻ ---------->H₂O
(released in cation (released in anion exchanger)
exchanger)
demineralized water is obtained by passing water successively through a cation exchange and an anion exchange resins.
in cation exchanger, Ca² ⁺, Mg²⁺,Na⁺ and other present cation in water are removed by exchanging with H⁺ ions while in anion exchanger, Cl⁻,HCO₃⁻,SO₄²⁻ etc, present in water are removed by exchanging them with OH⁻ ions
H⁺ + OH⁻ ---------->H₂O
(released in cation (released in anion exchanger)
exchanger)
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