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LSE 6
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krabby patty
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Cards (11)
What is the title of LSE 6?
Tollens'
Test: Which food samples contain reducing sugars?
What metal is used in Tollens' test to detect the presence of reducing sugar.
silver
How many mL of silver nitrate is placed in each of the test tubes?
1
What is added in the test tubes after the silver nitrate?
sodium hydroxide
(
NaOH
)
How many drop/s of sodium hydroxide is/are placed in the test tubes?
1
After shaking the test tubes, what is added dropwise until the mixture becomes colorless.
Ammonium hydroxide
(
NH4OH
)
How long are the test tubes heated in the water bath?
5
mins
_ result shows a silver mirror.
positive
_ results are the colorless solutions.
negative
What are the samples that showed a positive result?
Milk
Grape juice
What are the samples that resulted to colorless solutions?
Groundnut oil
Egg white
sucrose