Question

list two important precautions that we must observe while preparing a colloidal solution of starch

Answer 1

1,starch should be converted in fine paste before adding to the boiling water.
2, starch should be added in thin stream to boiling water.

Answer 2

Starch sol can be prepared by heating starch and water at 100℃.

The precautions are:

● The apparatus used for the preparation of sol must be dry and clean.

● Only distilled water should be used in the preparation.

● Starch should be added to the boiling water in a thin stream and steadily.

● Constant stirring of the content is necessary throughout the preparation.