The Pop Bottle Experiment

 

Keywords:  hydrogen, oxygen, water, energy,

 

Summary:  A pop bottle is filled with a 1:2 mixture of oxygen and hydrogen.  The Bunsen burner provides the initiation of the combustion reaction, and a loud pop is observed.

 

Hazards: 

It is important to use a thick walled vessel for this procedure. Use only the green "pop bottle" from the demonstration laboratory.

Hydrogen gas is very flammable.

Oxygen is an oxidizer.

 

Chemicals and Solutions: 

Hydrogen tank

Oxygen tank

 

Materials: 

Rubber hose

Trough

Coke bottle (Old glass, thick walled)

#2 solid rubber stopper

Bunsen burner

Matches

Heavy gloves and goggles

(2L beaker)

 

Procedure: 

Before class, fill the coke bottle and trough with water.  Displace 2/3 of the water with H2 and the remaining 1/3 of the bottle with O 2

In the classroom, set-up burner and matches in lecture room.

To set off the pop bottle, wear goggles and gloves, uncork the bottle and bring the bottle opening horizontally to the burner. BOOM!!!

 

Hints:  If preparing the demo in advance, cork bottle tightly with rubber stopper and invert the bottle in a beaker of water until classtime.

 

Discussion: 

 

 

Water is very stable!  Once heat provides the necessary activation energy, Ea , the reaction proceeds rapidly.  The initial heat and the energy released by the reaction expand the gases greatly, creating an explosive force within the confined space of the bottle.

 

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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