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प्रश्न
Discuss briefly de-mineralisation of water by ion exchange resin.
उत्तर
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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संबंधित प्रश्न
What is meant by ‘demineralised’?
Is demineralised or distilled water useful for drinking purposes? If not, how can it be made useful?
how can demineralised be obtained?
When sodium peroxide is treated with dilute sulphuric acid, we get ______.
Which of the following compounds is used for water softening?
Complete the following equations:
\[\ce{PbS (s) + H2O2 (aq) ->}\]
Complete the following equations:
\[\ce{CO (g) + 2H2 (g) ->[Cobalt][Catalyst]}\]
Match the items in Column I with the relevant item in Column II.
| Column I | Column II |
| (i) Hydrogen peroxide is used as a | (a) zeolite |
| (ii) Used in Calgon method | (b) perhydrol |
| (iii) Permanent hardness of hard water is removed by | (c) sodium hexametaphosphate |
| (d) propellant |
Assertion (A): Permanent hardness of water is removed by treatment with washing soda.
Reason (R): Washing soda reacts with soluble magnesium and calcium sulphate to form insoluble carbonates.
100 ml of a water sample contains 0.81 g of calcium bicarbonate and 0.73 g of magnesium bicarbonate. The hardness of this water sample expressed in terms of equivalent of CaCO3 is ______.
[Molar mass of calcium bicarbonate is 162 g mol-1 and magnesium bicarbonate is 146 g mol-1)
