De-Ionisation of Water

De-Ionisation of Water

(i) Water can be de-ionised by removing all dissolved salts with the help of cation and anion-exchanger resin.

(ii) Cation-exchanger is an organic synthetic resin such as polystyrene-containing a macroanion which has adsorbed H+ ions.

(iii) A resin containing a basic group  which has adsorbed  ions acts as anion exchanger.

In curing diseases : A number of drugs are adsorbed on the germs and kill them or these are adsorbed on the tissues and heat them.

Cleaning agents : Soap and detergents get adsorbed on the interface and thus reduce the surface tension between dirt and cloth, subsequently the dirt is removed from the cloth.

Froth floatation process

A low grade sulphide ore is concentrated by separating it from silica and other earthy matter by this method.

In adsorption indicators

Surface of certain precipitates such as silver halide, have the property of adsorbing some dyes like eosin, fluorescein etc.

Chromatographic analysis

The phenomenon of adsorption has given an excellent technique of analysis known as chromatographic analysis.

In dyeing : Many dyes get adsorbed on the cloth either directly or by the use of mordants.

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