Class 12 Chemistry Surface Chemistry Emulsions

Emulsions

  • Emulsions are colloids where both the dispersion phase and dispersion medium are liquids. These two liquids are immiscible or partially miscible. Generally one of the liquids is water.
  • There are two types of emulsions
  1. Oil dispersed in water (o/w type)- Water acts as dispersion medium

Example –Milk, vanishing cream

  1. Water dispersed in oil (w/o type)- Oil acts as dispersion medium

Example- Butter, Cream

  • Emulsions like water and oil separate into two layers and make the emulsion unstable. So emulsions are stabilised by stabilising agents.

 

  • o/w emulsions are stabilised by proteins, gum, natural and synthetic soaps
  • w/o emulsions are stabilised by metal salts of fatty acids, long chain alcohols

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