Colloids applications ?
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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.