.21 short method Define each of the following terms.
(i) Electrophoresis
(ii) Dialysis
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(i) Electrophoresis
It is the migration of electrically charged colloidal particles in one direction under the influence of an electric field. When colloidal particles move towards positive electrode, they are negatively charged and vice versa. Electrophoresis is used to measure the rate of migration of sol particles.
Dialysis
The process of removing a dissolved substance from the colloidal solution by means of diffusion through a suitable membrane is called dialysis. The apparatus used for this purpose is called dialyser (parchment paper or animal membrane).
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