Question

what is observed when sodium chloride is added to a colloidal solution of feric hydroxid​

Answer 1

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• When sodium chloride is added to ferric hydroxide solution coagulation of reddish-brown precipitate of ferric hydroxide take place.

@MissTranquillity

Answer 2

Answer:

Coagulation takes place when sodium chloride solution is added to a colloidal solution of hydrated ferric oxide.

→ The reason is that colloidal particles interact with ions (Na+,Cl-) carrying charge opposite to that present on themselves. This causes neutralisation of charges leading to their coagulation.