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Get Answers to all your Questions
5.9 How are the colloidal solutions classified on the basis of physical states of the dispersed phase and dispersion medium?
Answers (1)
The first criteria for classifying the colloids is the physical state of the dispersed phase and a dispersion medium. Depending upon whether the dispersed phase and the dispersion medium are solids, liquids, or gases, there are eight types of colloidal systems -
(1). Depending upon the physical state of dispersed phase and dispersion medium whether these are solids, liquids or gases, eight types of colloidal systems are possible. For example Solid sol, Emulsion, solid foam, Aerosol, etc.
(2). On the basis of nature of dispersed phase, colloids are classified as :
(a) Multimolecular colloids, e.g., gold sol, sulphur sol etc.
(b) Macromolecular colloids, colloids, e.g., cellulose, starch, etc.
(c) Associated colloids, e.g., soaps, synthetic detergents.
(3). On the basis of the interaction between the dispersed phase and the dispersion medium, colloids are of two types :
(a) Lyophilic colloids, e.g., gum, gelatin etc.
(b) Lyophobic colloids, e.g., metals, their sulphides etc.
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