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GCSE Chemistry · key term
An orange solution of bromine in water, used to test for a carbon–carbon double bond.
Used by Edexcel
Specification 9.15C · Paper 2
Revise: Bromine Water TestLooking at two colourless hydrocarbon samples would not necessarily reveal which is the alkane and which is the alkene, but their reactions with bromine water are different.
State both observations when asked how to distinguish the substances: an alkene turns bromine water from orange to colourless, whereas an alkane leaves it orange.
Use colourless, not clear. Bromine water is already a clear liquid when it is orange.
State the full observation: bromine water changes from orange to colourless, rather than merely saying that it becomes ‘clear’.
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