LSE 6

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