Food Tests

Question 1

Describe the test for starch

Answer 1

1. Using a measuring cylinder, measure 2 mL of water into a test tube
2. Add a small spatula of starch and shake
3. Add four drops of iodine
4. Look at the colour change of the iodine

Question 2

Describe the first test for protein

Answer 2

1. Measure 2 mL of water into a test tube
2. Add a small spatula of protein powder and shake
3. Add 2ml of Biuret solution
4. The card the colour change of the biuret solution

Question 3

Describe the food test for fat

Answer 3

1. Place 3 drops of oil into a tube
2. Add 5ml of ethanol and shake the test tube to dissolve the oil
3. Leave the tube to settle for two minutes
4. Paul the top 2/3 of liquid into a clean test tube
5. Add a small amount of water and record the colour change

Question 4

Describe the food test for sugar

Answer 4

1. Measure 3 mL of water into a boiling tube
2. Add a spatula of glucose and shake
3. Add 3 mL of Benedict’s solution
4. Half fill a beaker with water and heat it on the tripod and gauze until the water is boiling
5. Turn off the Bunsen
6. Stand the boiling tube containing glucose and Benedict’s solution in the water and record what happens

Question 5

What safety precautions need to be taken for the vitamin C test?

Answer 5

Where goggles

Lab coat

Question 6

Describe the vitamin c food test

Answer 6

1. Collect a test tube and carefully measure 5 mL of DCPIP into it with a measuring cylinder
2. Measures 25 mL of vitamin c solution into a small beaker
3. Using a teat the pet add ascorbic acid to the DCP I P drop by drop. Shake the test tube between each drop and count the number of drops added
4. Keep adding ascorbic acid until there is a colour change