Long Answer TypeExplain what is observed
(i) when a beam of light is passed through a colloidal sol.
(ii) an electrolyte, NaCl is added to hydrated ferric oxide sol.
(iii) electric current is passed through a colloidal sol?
Short Answer TypeLong Answer TypeShort Answer TypeLong Answer TypeAnswer:
The colloidal solution in whichboth the dispersed and dispersion medium are liquid is called an emulsion.
Uses of emulsification:
(i) Removal of grease, oils and dirt from the skin, garments and utensils is due to the role of soap as an emulsifier during washing with water.
(ii) Many pharmaceutical preparations like cod liver oil and Halibit liver oil are emulsions. The emulsifying agents used for this purpose are agar and gumacacia. The emulsified oil is readily acted upon by the digestive juices.
(iii) Many lotions, creams and ointments are emulsions of O / W type or W / O type.
(iv) The disinfectants like phenyl and lysol yield
emulsions of O/W type when poured in water.
(v) Emulsions are of physiological importance also. Emulsification facilitates the digestion of fats in the digestive tract by bringing the fats, water and digestive enzymes into contact with other.
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