What are the dispersed phase and dispersion medium in the following colloids? Also give one example of each. (a) Gel (b) Foam (c) Aerosol (d) Sol (e) Emulsion
Answers
1. gel. liquid. . solid.
2. foam. gas. liquid.
3. aerosal. liquid. gas.
4. sol. gas. solid.
5. emulsion. liquid. liquid.
Explanation:
Dispersed phase:
The phase that is dispersed or that is present as colloidal particles is referred to as the dispersed phase.
Dispersion medium:
The term "dispersion medium" refers to the medium in which colloidal particles are disseminated.
Ex: In a starch solution, water serves as the dispersion medium and starch as the dispersed phase.
Examples of colloids:
a) Gel
A colloid called gel has a liquid dispersed phase and a solid dispersed medium. Examples include cheese, butter, etc.
b) Foam
A form of colloid known as foam contains solid as the dispersion medium and gas as the dispersed phase. Examples include sponge made of rubber and foam.
c) Aerosol
The liquid is the dispersed phase and gas is the dispersion medium in an aerosol, a form of a colloid. Examples include mist, fog, and clouds.
d) Sol
It is a form of colloid in which the liquid serves as the dispersion medium and the solid serves as the dispersed phase. Examples include mud and milk of magnesia.
e) Emulsion
Both the dispersed phase and the dispersed medium are liquids in an emulsion. Milk and face cream are some examples.
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