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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?

Respuesta :

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.

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