Electrolytes can cause coagulation as well as peptization of colloidal solution. Explain ?

Explanation

Electrolytes provide oppositely charged ions which can cause coagulation of colloidal solution. Electrolytes can cause preperptization also, e.g., `FeCl_(3)` can peptize `Fe(OH)_(3)` precipitate because it gives excess of `Fe_(3+)` ions which get adsorbed on `Fe(OH)_(3)` precipitates. This breaks up the precipitate into smaller particles of the size of colloid.