Question

Materials required: rood items test tubes sodium hydroxide solution copper sulphate solution, and
Practice Question 11
11.17 Prom the experiment and now in your absenverions below.
Aim: To test for the presence of protein in a food item
Steps
5.
Observation: When the teacher put the mixture of sodium hydroxide and copper sulphate solution
on different food items I observed that
turned the solution purple.
did not turn the solution purple
2.
Food items which turn the mixture of sodium hydroxide and copper sulphate purple contain proteins
in them.
Conclusion: Based on my observations, I conclude that​

Answer 1

Answer:

Explanation:

Following steps are used to test if a food item contains protein.

1) Take a small quantity of the food item to be tested.

2) Grind/mash the food item.

3) Put the food item into a test tube.

4) Add 10 drops of water and shake the test tube.

5) Add two drops of copper sulphate solution to the test tube, using a dropper.

6) Add 10 drops of caustic soda solution using a dropper and shake the test tube.

7) Let the test tube rest in a test tube stand for a few minutes.

8) Observe the colour of the mixture.

9) Violet colour indicates the presence of proteins in the tested food item.