Microscale Chemistry Experimentation for Teachers
14.
Reaction of ethylene and bromine: Electrophilic addition
* Mix 3 ml of ethanol and 2 ml of conc.
sulfuric acid in a
25 ml vial.
* Heat on an electric hot plate until
bubbles can be seen.
* Close it by a nozzled rubber stopper
to which a
narrow gas delivery tube is attached
with its other
end inserted into the tip of a
50-ml syringe.
* The syringe full of water is placed
in a glas beaker.
* The water in the syringe will be replaced
by ethylene gas which
is washed by the water in
the beaker.
No photos: A brown solution of bromine
in water is decolourized by the ethylen gas pumped into it from the syringe.