Question

Give the applications of colloids in precipitation of smoke

Answer 1

1. Medicines:-most of medicines used are in colloidal form

(a) Argyrol used as an eye lotion is silver sol

(b) Milk of magnesia used an antacid is emulsion

2. Artificial rain:-Artificialrain can be brought by spraying electrified or oppositely charged colloidal dustor sand particles over a cloud.

3. Formation rain :– River water contains charged colloidal particles of clay, sand and many other materials

Sea water is store house of electrolytes. Thus river water comes in contact with sea water the colloidal particles or river water gets coagulated due to the sea’s electrolytes and settle down to forming a huge mass of sand known as delta.

Purification of water:- the precipitation of colloidal impurities present in water can be done by adding electrolytes like alum.

4. Smoke precipitation:– Smoke particles are actually electrically charged colloidal particles of carbon in the air peptization of the smoke particles is carried out by cotterell precipitator which is based upon the principle of electrophoresis.

Answer 2

Answer:

(1) Electrical precipitation of smoke : Smoke is an exerosol or a colloidal solution of solid particles of carbon, dust, arsenic or sulphur compounds, etc. When the smoke is passed through a chimney, provided inside with charged plates, the charge on colloidal particles is neutralise and hence get precipitated on the floor of then chamber. This process is called cottrell process.

(2) Purification of water : Colloidal particles in an impure water are removed by coagulating them by addition of alum. This gives potable water.

(3) Medicines : Colloidal medicines are more effective due to large surface area to volume ratio of colloidal particles and they can be easily assimilated by body. Some of the medicines are argyrol which is a silver sol used as an eye lotion, an emulsion of milk of magnesia is used in stomach disorders.

(4) Rubber industry : Rubber is obtained by coagulation of latex.

(5) Cleansing action : The cleansing action of soaps and detergents is due to their colloidal properties.

(6) Industrial goods : A large number of industrial products like photographic plates, films, paints, rubber, graphite products, etc. are colloid.