Preparing Colloidal Ferric Hydrochloride

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AIM: To prepare a colloidal sol of ferric hydroxide.


Ferric hydroxide forms a lyophobic sol with water which is the dispersion medium.  It is prepared by the hydrolysis of ferric chloride with boiling distilled water as per the reaction:

FeCl3 (aq) + 3H2O →   Fe(OH)3  +  3HCl (aq).

The HCl formed during the reaction tries to destabilize the sol and therefore should be removed from the sol by dialysis. A wine red sol of ferric hydroxide is obtained.


Experiment Observation Inference
Take 50 ml of distilled water in a beaker and heat it to about 1000C.  Add the sol of FeClto water with stirring. A wine red sol is obtained Sol of ferric hydroxide has been prepared

RESULT– Colloidal sol of ferric hydroxide has been prepared.

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