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.
|Take 50 ml of distilled water in a beaker and heat it to about 1000C. Add the sol of FeCl3 to 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.