Indicators/ Testing

Question 1

What colour does hydrogencarbonate indicator solution turn in the presence of carbon dioxide?

Answer 1

Yellow (or orange)

Question 2

What colour does hydrogencarbonate indicator turn in the absence of carbon dioxide?

Answer 2

Purple

Question 3

What colour is hydrogencarbonate indicator normally (in the atmosphere)?

Answer 3

Red or orange

Question 4

What does hydrogencarbonate indicator detect?

Answer 4

Carbon dioxide

Question 5

What does Biuret reagent test for?

Answer 5

Protein

Question 6

What does iodine test for?

Answer 6

Starch

Question 7

What does Benedict’s reagent test for?

Answer 7

Glucose (reducing sugar)

Question 8

What colour does Biuret reagent turn if protein is present?

Answer 8

Mauve/purple

Question 9

What colour does iodine turn if starch is present?

Answer 9

Blue-black

Question 10

What colour does Benedict’s reagent turn if glucose is present?

Answer 10

Orange or brick-red

Question 11

What is used to test for vitamin C?

Answer 11

DCPIP

Question 12

What is a positive result when testing for vitamin C?

Answer 12

DCPIP turns from blue to clear.