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Define the following terms with suitable examples: (i) Peptisation (ii) Electrophoresis.(iii) Dialysis |
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Answer» (i) Peptisation: It is the process of conversion of fresh precipitate into colloidal particles by shaking it with dispersion medium in the presence of a small amount of suitable electrolyte. e.g., a reddish-brown coloured colloidal solution is obtained from fresh precipitate of Fe(OH)3 by shaking it with a small quantity of a dilute solution of FeCl3. (ii) Electrophoresis: It is the movement of colloidal particles under the influence of the electric field, e.g., when a positive charged ferric hydroxide sol is subjected to an electric field, the colloidal particles migrate towards cathode. (iii) Dialysis: It is the process of separation of the colloidal particles from those of crystalloids by diffusion of the mixture through a semipermeable membrane e.g., blood is purified in the kidneys because walls of the kidneys are semipermeable. |
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