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Colloidal State

Colloidal solution is heterogeneous in nature and always consists of at least two phases, namely disperse phase and dispersion medium. The component present in small proportion and consisting of particles of colloidal dimensions is called the dispersed phase. The medium in which colloidal particles are dispersed is called the dispersion medium. The two phases can be solid, liquid, or gas. There are eight different types of colloidal solutions.
 
Disperse phase
Dispersion medium
Common name
Example
Solid
Solid
Solid sol
Alloys
Liquid
Sol
Gold sol, paints
Gas
Aerosol
Smoke, dust
Liquid
Solid
Gel
Cheese, butter, table jellies, pearl
Liquid
Emulsion
Milk, emulsified oils
Gas
Liquid aerosol
Mist, fog, cloud
Gas
Solid
Solid foam
Pumice stone
Liquid
Foam
Soap lather, whipped cream
 
If colloidal solution has fluid-like appearance, it is called sol. The dispersion medium in such cases is generally liquid. Depending on the nature of medium, colloids are sometimes given special names.
 
Dispexrsion medium Name of the sol
Water Hydrosol
Alcohol Alcosol
Benzene Benzosol
Gases Aerosol




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