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Types Of Colloidal Systems

Chemical Bonding Assignment / Homework Help
A colloidal system with finely divided particles with diameter lying between 1nm and 200nm can exist in two phases. Each one of the phase is scattered or dispersed in the other. The phase which is scattered is called the dispersed phase, the internal phase or the discontinuous phase. The phase in which the dispersion is taking place is called the dispersion or medium or the external or the continuous phase. The dispersion phase is the major phase of the system as it constitutes the major fraction of the system.

Each of the two phases may be solid, liquid or gas resulting in several different types of colloidal systems depending on the state of the dispersed and dispersion phases.


Different colloidal systems and their examples:

Dispersed phase Dispersion medium Examples

Solid

Solid

Colored glasses, rock salt, porcelain, alloys.

Solid

Liquid

Starch, proteins and gold solution

Solid

Gas

Smoke, dust, fumes.

Liquid

Solid

Curd, cheese, jellies

Liquid

Liquid

Milk, cream, certain medicines

Liquid

Gas

Clouds, fog, mist

Gas

Solid

Occluded gases in metals, pumice stone

Gas

Liquid

Foam, froth, soap, leather

Gas

Gas

unknown



The colloidal systems with solid as dispersed phase and liquid as dispersion medium are known as sols. In case the dispersion medium of colloidal system is gas, the system is known as aerosol. When the liquid medium is water the system is known as aquasol or hydrosol. In case of alcohol, benzene or any other organic liquid, the stem is termed as alcosol, benzosol or orgaosol, respectively.


Solved problems
  • Name the two phases of a colloidal system?
    • Dispersion and dispersed phase.
    • The two phases cannot be distinguished.
    • Continuous phase and discontinuous phase
    • A and C
    Ans: d
  • Give examples for colloidal systems in which the dispersed phase is gas and the dispersion phase is liquid.
    • Foam, froth, soap leather.
    • Unknown.
    • Gases in metals
    • Gases accumulated in a pumice stone.
    Answer: a
  • Give examples for colloidal systems in which the dispersed phase is liquid and the dispersion phase is also a liquid.
    • Curd, cheese.
    • Milk, cream.
    • Jellies
    • Mist
    Answer: b
  • Colloidal systems with solid as dispersed phase and liquid as dispersion medium are known as
    • Sol
    • Gel
    • Not known
    • Depends on the dispersion medium being used.
    Answer: a
  • The size of colloidal particles ranges from
    • 1nm to 100nm
    • 1nm to 200nm
    • Above 100nm
    • Below 1nm
    Answer: b

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