Reaction with Bromine
Make sure to keep the bromine under the hood – the Br2 fumes can irritate the
throat and sinuses. If bromine is spilled on the skin, flood the area with water for 10
minutes.
You will be testing 4 different liquids: hexane, cyclohexene and toluene. In the hood,
place 5 drops of each liquid to be tested in separate clean, dry test tubes. Label the tubes.
Carefully add 3 drops of the bromine solution to each tube. Note whether the orange color
of the bromine disappears immediately or not. The disappearance of the bromine color is a
positive reaction. If the test is negative, shine UV light on the tube for up to 2 minutes and
note whether the color disappears.