Explain the term dialysis with a suitable example.

Explanation

It is the process by which colloidal solution containing ionic impurities is purified using semipermeable membrane which allows the passage of ions but not colloidal particles. For example, if egg albumin sol is mixed with sodium chloride solution, `Na^(+)` and `Cl^(-)` ions will pass through semipermeable membrane whereas pure colloidal solution will be obtained.