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 What happens when a freshly precipitated Fe(OH)3 is shaken with little amount of dilute solution of FeCl3?

When freshly precipitated Fe(OH)3 is shaken with little amount of dilute solution of FeCl3 (electrolyte), peptization process (ions of the electrolyte are adsorbed by the precipitate particles)  takes place by converting the Fe(OH)3 precipitate into colloidal solution (positively charged solution of Fe(OH)3.

 

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 when a freshly precipitated Fe(OH)3 is shaken with little amount of dilute soln of FeCl3 a reddish brown colloidal soln of Fe(OH)3 is obtained. this is called peptisation. the Fe3+ ion from FeCl3 are adsorbed on the surface of the precipitate and from positively charged colloidal solution .

FeCl3 -------> Fe3+ + 3Cl-

Fe(OH)3 + Fe3+ -------> [Fe(OH)3]Fe3+ + 3Cl-

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