Q. 22

Explain the follo

Answer :

1. An aerosol is a colloid in which dispersed phase is a solid and dispersion medium is a gas. Atmospheric aerosols are solid and liquid particles suspended in air. Eg. Dust, smoke.



Aerosol


2. An emulsion is a special type of mixture made by combining two liquids that normally don't mix (immiscible). It is a colloid of two or more immiscible liquids where one liquid contains a dispersion of the other liquids. This process of turning a liquid mixture into an emulsion is called emulsification. Eg. Butter.



3. Associated colloids or micelles are those colloids which act like strong electrolytes at lower concentrations but at higher concentrations, they exhibit colloidal properties.


At a particular concentration, the molecules of dispersed phase align in such a way as to form micellar structures. This particular concentration is known as critical micellar concentration. Thus those colloids that form micelles are known as associated colloids.


So, when soaps are mixed with water, above critical micelle concentration, it leads the formation of associated colloids.



Micelles.


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