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.
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:
Coke bottle (Old glass, thick walled)
#2 solid rubber stopper
Heavy gloves and goggles
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.
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.