Maharashtra State BoardSSC (English Medium) 8th Standard

Colloidal Solution




  • Dispersed Phase: The phase that is dispersed or present in the colloidal particle shape is called the dispersed phase. 
  • Dispersion medium: Dispersion medium is the continuous phase of a colloid. It is the phase in which the dispersed phase is distributed.


Colloidal solution:

The particles of a colloid are uniformly spread throughout the solution. Due to the relatively smaller size of particles, the mixture appears to be homogeneous. But actually, a colloidal solution is a heterogeneous mixture, for example, milk.

Properties of a colloid

  • A colloid is a heterogeneous mixture.
  • The size of particles of a colloid is too small to be individually seen by naked eyes.
  • Colloids are big enough to scatter a beam of light passing through it and make its path visible.
  • They do not settle down when left undisturbed, that is, a colloid is quite stable.
  • They cannot be separated from the mixture by the process of filtration. But can be separated through centrifugation.

The components of a colloidal solution are the dispersed phase (solute-like) and the dispersion medium (solvent-like)

Common examples of colloids:

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