Why it coagulate when a solution of sodium chloride is added to ferric hydroxide?
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if we assume NaCl is added to colloidal solution of Fe(OH)3 ,if ferric hydroxide is positive sol then then charge of it is neutralize and precipitation of colloidal solution take place.
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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.
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