draw a neat labelled diagram to show how you will purify colloidal solution from the electrolytic impurities using electric current

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Solution

Following methods are used to purify a colloidal solution which has particularly electrolytes as impurities.
Dialysis: Colloidal solution is taken in a porous membrane bag and dipped into running water. The electrolytic impurities are washed away, leaving behind pure colloidal solution in the membrane bag.
Electro dialysis: Method is similar to dialysis but movements of ions are accelerated by using electrodes
Ultrafiltration: High quality filter papers called impregnated filter papers are used for the filtration of sol.
Ultracentrifuge: A high speed centrifuge machine is used to settle impurities.

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