Photochemical Reaction with Bromine

 

Hazards: 

Bromine is corrosive and toxic.

Carbon tetrachloride is a cancer suspect agent

Toluene is flammable and toxic.

Chemicals and Solutions: 

Materials: 

Two vials of toluene (about 10 ml each)

5% bromine in carbon tetrachloride solution

Plastic eyedropper

Procedure: 

Add a few drops of the bromine solution rapidly to each of the vials of toluene. Show the class the orange solution produced. Place one of the vials on the overhead projector and watch this solution decolorize rapidly. The vial not placed on the overhead will decolorize much more slowly.  This demo can be scaled up to be done in small hydrometer cylinders.  Students will be able to see the the bromine fading out starting from the bottom and moving up the cylinder.

Hint: 

Discussion: 

The halogenation reaction is a substitution reaction that takes place by a free radical mechanism.

         

To schedule a demonstration, please send an email to the demonstration lab.

 

Contact:

Eric Camp

Lecture Demonstration Technician

Bagley Hall 171

(206) 543-1606

ericcamp@uw.edu

 

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