Chemical Tests
- 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
- Bromo
- Haloalkane in ethanol warmed with aqueous silver nitrate solution.
- Alcohols
- Potassium Dichromate
- Secondary
- Orange to green
- primary
- Orange to Green
- Tertiary
- No change
- Secondary
- Potassium maganante
- Secondary
- Purple to colourless
- Primary
- Purple to colourless
- Tertiary
- No hange
- Secondary
- To distinguish between primary and secondary alcohols. Reduce back to aldehydes/ ketones and then use either tollens or fehlings
- Potassium Dichromate
- Distinguishing between Aldehydes and Ketones
- 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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