Chemical Tests

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  • Created by: melissa
  • Created on: 24-12-12 13:08
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  • Chemical Tests (assumed knowledge)
    • Distinguishing between Aldehydes and Ketones
      • Tollens- Ketone will produce no change. Aldehyde will produce a silver mirror
      • Fehlings- Ketone will produce no change. Aldenyde with form a red percipitate
      • K2Cr2O7/H+-Ketone will stay orange. Aldehyde will turn solution green
    • Alkene
      • Add Bromine water. Alkene will decolourise it.
    • Haloalkanes
      • Haloalkane in ethanol warmed with aqueous silver nitrate solution.
        • Bromo
          • PPT= Cream
          • After adding dilute NH3 precipitate is insoluble
          • After adding conc NH3, The ppt dissolves to produce a colourless solution
        • Iodo
          • PPT: Yellow
          • Insoluble in  dilute and conc NH3
        • Chloro
          • PPT: White
          • Soluble in both duilute and con NH3
    • Alcohols
      • Potassium Dichromate
        • Secondary
          • Orange to green
        • primary
          • Orange to Green
        • Tertiary
          • No change
      • Potassium maganante
        • Secondary
          • Purple to colourless
        • Primary
          • Purple to colourless
        • Tertiary
          • No hange
      • To distinguish between primary and secondary alcohols. Reduce back to  aldehydes/ ketones and then use either tollens or fehlings
  • Distinguishing between Aldehydes and Ketones
    • Tollens- Ketone will produce no change. Aldehyde will produce a silver mirror
    • Fehlings- Ketone will produce no change. Aldenyde with form a red percipitate
    • K2Cr2O7/H+-Ketone will stay orange. Aldehyde will turn solution green

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