A student adds some ethanol to a solution containing 'X' food item. The solution
turns cloudy. What could be the 'X' food item? Name one source of this food item.
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Test for starch
Take the food sample.
If it is a solid crush it using a mortar and pestle.
Add water and mix it.
Crush the sample until it turns into a semi-liquid state
Add brown iodine soln.
If the liquid on addition turns blue-black there in presence of starch
Test for protien
Take a small quantity of the food items to be tested.
Grind/mash the food item.
Put the food item into a test tube.
Add 10 drops of water and shake the test tube.
Using a dropper add two drops of copper sulphate solution to the test tube.
Add 10 drops of caustic soda solution and shake the test tube.
Observe the colour of the mixture.
Violet colour indicates the presence of proteins in the tested food item.
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