Add equal volume of Benedicts reagent to sample. Heat in gently boiling water bath for five minutes. Turns orange-brown if positive.
1 of 5
Test for non-reducing sugars
Perform test for reducing sugars. Add 2cm of hydrochloric acid to a new 2cm sample. Slowly add sodium hydrogencarbonate. Reperform reducing sugars test. Should be positive.
2 of 5
Test for starch
Add 2 drops of iodine solution to 2cm of sample and shake/stir. Turns blue-black if positive.
3 of 5
Test for lipids
Add 5cm of ethanol to 2cm of sample and shake thoroughly. Add 5cm of water and shake gently. Turns cloudy-white if positive.
4 of 5
Test for proteins
Add equal volume of sodium hydroxide to sample at room temperature. Add a few drops of very dilute copper (II) sulfate and gently mix. Turns purple if positive.
5 of 5
Other cards in this set
Card 2
Front
Perform test for reducing sugars. Add 2cm of hydrochloric acid to a new 2cm sample. Slowly add sodium hydrogencarbonate. Reperform reducing sugars test. Should be positive.
Back
Test for non-reducing sugars
Card 3
Front
Add 2 drops of iodine solution to 2cm of sample and shake/stir. Turns blue-black if positive.
Back
Card 4
Front
Add 5cm of ethanol to 2cm of sample and shake thoroughly. Add 5cm of water and shake gently. Turns cloudy-white if positive.
Back
Card 5
Front
Add equal volume of sodium hydroxide to sample at room temperature. Add a few drops of very dilute copper (II) sulfate and gently mix. Turns purple if positive.
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