Testing For Biological Molecules Flashcards
1
Q
Test for starch
A
Add iodine solution
Careful iodine stains
Colour change from orange to blue-black
2
Q
Test for fats/lipids
A
Add ethanol Shake Allow stand for one minute Ethanol is flammable and harmful Colourless to cloudy
3
Q
Test for proteins
A
Add a few drops of copper Sulfate solution - harmful
Add a few drops of sodium hydroxide - irritant
Colour change from pale blue to purple
4
Q
Test for glucose/reducing sugars
A
Add a few drops of Benedict solution to substance
Heat tube in water bath
Colour change from blue to orange-red
5
Q
What’s the adv of using a water bath
A
It is safer, no naked flame
6
Q
How can you make sure u see the accurate colour
A
Place a white tile or paper behind to see colour clearly
