Indicators/ Testing Flashcards
What colour does hydrogencarbonate indicator solution turn in the presence of carbon dioxide?
Yellow (or orange)
What colour does hydrogencarbonate indicator turn in the absence of carbon dioxide?
Purple
What colour is hydrogencarbonate indicator normally (in the atmosphere)?
Red or orange
What does hydrogencarbonate indicator detect?
Carbon dioxide
What does Biuret reagent test for?
Protein
What does iodine test for?
Starch
What does Benedict’s reagent test for?
Glucose (reducing sugar)
What colour does Biuret reagent turn if protein is present?
Mauve/purple
What colour does iodine turn if starch is present?
Blue-black
What colour does Benedict’s reagent turn if glucose is present?
Orange or brick-red
What is used to test for vitamin C?
DCPIP
What is a positive result when testing for vitamin C?
DCPIP turns from blue to clear.
