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Which of the following methods can be used to purify a colloidal solution?

1. Dialysis
2. Electrodialysis
3. Electrophoresis
4. Ultrafiltration

Correct answer: Dialysis

Solution

Dialysis passes the colloidal sol through a semipermeable membrane (parchment/cellophane), allowing small crystalloid molecules to diffuse out while retaining colloidal particles. Electrodialysis and ultrafiltration also purify colloids. Electrophoresis is NOT a purification method. The primary textbook answer is dialysis.

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