Question

Three samples were taken and were put in three test tubes each named as A,B and C. In A, milk was added, B had meat pieces and C had crushed potatoes in it. Observe the names of tests written above each test tube and write (for all test tubes) • Material Required • The Procedure • Expected End Results • Conclusions • Safety Measures (if any) If you find any negative result. Explain why it is so?

Answer 1

Answer:

A is the test of protein, B is the test for fat and C is the test for starch

Explanation:

For A, the materials required are;

• water
• copper sulphate solution
• A dropper
• caustic soda solution

- the procedure;

• with the dropper, add 10 drops of water and shake the test tube
• add 2 drops of copper sulphate solution
• add 10 drops of the caustic soda solution, shake and observe.

- the result and conclusion;

if the solution turns violet, protein is present.

For B, the materials needed are;

• paper

- the procedure;

• wrap the meat in the paper and crush it
• unwrap the meat, straighten the paper
• then let it dry and observer

- the result and conclusion;

if an oily patch is observed in the paper, then fat is present.

For C, the materials are;

• iodine
• dropper

- the procedure;

• add a few drops of the iodine to the crushed potatoes

- the result and conclusion;

if a blue-black coloration is observed, starch is present.