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Emulsions:- An emulsion is a colloidal dispersion in which both the dispersed phase and the dispersion medium are liquids.

Emulsifiers or emulsifyingagent:- The emulsion are generally prepared by shaking strongly the mixture of two colloids these emulsions are generally unstable. The substance a thus added to stabilize the emulsions are called emulsifiers or emulsifying agents.

Types of Emulsions:-
The emulsions can be classified in two types:-

  1. Emulsion of oil in water(o/w):- the emulsion in which oil is the dispersed phase and water is the dispersion medium.
    Ex. Milk is an emulsion of liquid fat in water.
  2. Emulsion of water oil(w/o):- the emulsion in which water is the dispersed phase and oil is the dispersion medium.
    Ex. Codliver oil is an emulsion of water in oil.

Demulsification:- the process of separation of constituent Liquids of an emulsion is called as Demulsification.

  • They can be separated into their constituent particles by boiling, Freezing, centrifuging, by adding large amounts of electrolytes etc.

Application of emulsions:-

  1. Asphalt emulsified water is used for buiding roads without necessity of melting Asphalt.
  2. Several oily drugs are in the form of emulsions.
  3. The cleaning action of ordinary soap for washing clothes, crockery, is based upon formation of water-oil emulsion.
  4. Certain disinfectants like Dettol are emulsions of oil-in-water type on mixing with water.
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Class 12 Chemistry Surface Chemistry All Topic Notes CBSE Class 12 Chemistry All Chapters Notes

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