What are emulsions? How are they classified? Describe the applications of emulsions.
Answers
Emulsions :- i) A dispersion of finely divided liquid droplets in another liquid dispersion medium is emulsion.
ii) In emulsions one liquid is 'water' and other liquid is immiscible in water is called 'oil'.
Types of emulsions :- Emulsions are classified into two types. There are (a) oil in water (o/w) ; (b) water in oil (w/o)
(a) oil in water :- In this type of emulsion the dispersed phase is oil ( immiscible liquid ) and the dispersion medium is water.
Eg :- Milk : liquid fat (oil) in water
vanishing cream : fat (oil) in water
(b) Water in oil :- In this type of emulsion the dispersed phase is water and dispersion medium is oil (immiscible liquid)
Eg :- Stiff grease : water in lubrication oil
Cold cream : water in fat
Emulsions are very useful systems and find a number of applications :
- A large number of pharmaceuticals are prepared in the form of lotions, creamd and ointments.
- The concentration of sulphide ore by froth flotation process.
- Emulsifying properties of soaps and detergents are used in washing clothes, crockery etc.,
- Digestion of fats in the intestine is facilitated by emulsification.
What are emulsions? How are they classified? Describe the applications of emulsions.