AIM: To prepare a colloidal sol of ferric hydroxide.
THEORY:
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.
PROCEDURE:
| Experiment | Observation | Inference |
| 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.
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