4. Mohit added copper sulphate and caustic
soda solutions to a food containing protein.
Can you tell change in colour of the food?
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drates).
Test for Proteins
When a few drops of a solution of copper sulphate and caustic soda are applied to a part of food, a violet colour shows the presence of proteins.
Test for Fats
An oily patch on paper shows that the food has fats.
The food items may sometimes contain a little water.
Therefore, after you have rubbed an item on paper, let the paper dry for a while. If there were any water that may have come from food, it would dry up after some time.
If no oily patch shows up after this, the food item does not contain any fat.
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