BRAINCAKETest Tube Tests for Organic Compounds
Simple test tube tests can identify the functional group in an organic compound. They form AQA Required Practical 6.
Alkene (C=C): bromine water
Shake the sample with bromine water. An alkene turns the orange solution colourless.
Primary or secondary alcohol (and aldehyde): acidified potassium dichromate(VI)
Warm with acidified potassium dichromate(VI) in a water bath. The solution turns from orange to green. Tertiary alcohols and ketones give no change.
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Key terms in this lesson
- aldehyde
- An organic compound containing the -CHO functional group at the end of a carbon chain.
- ketone
- An organic compound containing a C=O group bonded to two carbon atoms within the chain.
- carboxylic acid
- An organic compound containing the -COOH functional group.
More in Organic Analysis
- Identifying Functional Groups
- High Resolution Mass Spectrometry
- Precise Relative Molecular Mass
- Infrared Spectroscopy
- Bond Vibrations and IR Absorption
- The Fingerprint Region
- Interpreting IR Spectra
- Infrared Radiation and the Greenhouse Effect
All 9 lessons in Organic Analysis · All AQA AS-level Chemistry topics