1.

Discuss the factors that influence the colour of colloidal solutions.

Answer»
  • Colour of colloidal solution depends on the wavelength of light scattered by dispersed particles.
  • The colour of colloidal dispersion also changes with the manner in which the observer receives the light.

e.g. Mixture of a few drops of milk and large amount of water appears blue when viewed by the scattered light and red when viewed by transmitted light.

  • It also depends on size of colloidal particles.

e.g. Finest gold sol is red in colour whereas with increase in size it appears purple.


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