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Electrolytes can cause coagulation as we...

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

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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.
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