5197840
Description
Flashcards by daisy williams, updated more than 1 year ago
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Created by daisy williams
about 8 years ago
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| Question | Answer |
| What is the test for starch? | Iodine solution |
| What is the test for reducing sugars? | Benedict's solution |
| What is the test for protein? | Buiret Solution |
| What is the test for fats? | Ethanol |
| What colour does iodine solution turn when Starch is present? | Yellow/Brown TO Blue/Black |
| What colour does Benedicts solution turn when there is a positive test for reducing sugars? | Bright blue TO Red/Orange |
| What colour does biuret solution turn when there is a positive test for protein? | Blue TO Purple/Lilac/Violet |
| What happens to ethanol when there is a positive test for fats? | A white emulsion which looks cloudy or white in colour |
| How do you test for starch in a leaf? | *Submerge leaf in boiling water *Put leaf into a test tube of ethanol *Leave to stand for aprox. 10 mins *Wash the leaf in cold water *Spread the leaf out flat on a white tile *Add a few drops of iodine solution *Turn Blue/Black if positive |
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