Preparing a colloidal sol of starch

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AIM: To prepare a colloidal sol of starch.


Starch forms a lyophilic sol with water which is the dispersion medium. The sol of starch can be prepared by water to about 1000C. The sol is quite stable and is not affected by the presence of an electrolytic impurity.


Experiment Observation Inference
Take 50 ml of distilled water in a beaker and heat it to about 1000C.  Add a thin paste of starch to water with stirring. A colourless, translucent sol is obtained. Sol of starch has been prepared.

RESULT– Colloidal sol of starch has been prepared.

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