PRE LAB DISCUSSION
Removal of the stopper from an any opaque bottle or container results in the delayed evolution of a large cloud of water vapor some what like the mystical "jinni".
Removal of the stopper from an any opaque bottle or container results in the delayed evolution of a large cloud of water vapor some what like the mystical "jinni".
MATERIALS
SAFETY PRECAUTIONS
SCIENTIFIC PRINCIPLES
PROCEDURE
- Hydrogen Peroxide, H2O2
- Potassium Iodide, KI
- A large Bottle
- Stopper
- Rubber Gloves
- Tea Bag
- Safety Goggles
- Table Spoon
SAFETY PRECAUTIONS
- WEAR RUBBER GLOVES
- WEAR SAFETY GOGGLES
- CONTACT WITH HYDROGEN PEROXIDE MAY CAUSE BURNS
SCIENTIFIC PRINCIPLES
- Water Vapor is the gas phase of water
- Water Vapor is lighter or less dense than dry air
PROCEDURE
- Obtain a large opaque bottle and a stopper or cap to fit.
- Add 30-50 mL of 30% hydrogen peroxide to the bottle. CAREFUL: WEAR RUBBER GLOVES and SAFETY GOGGLES. WHEN HANDLING 30% HYDROGEN PEROXIDE. CONTACT WITH THE SKIN MAY CAUSE BURNS.
- Remove the tea from a tea bag and refill it with 1/4 table spoons of solid potassium iodide. Tie the tea bag securely with its string.
- Place the tea bag inside the neck of the bottle. While holding the string/ insert the stopper to hold the bag in place.
- When ready to perform the demonstration/ remove the stopper and allow the tea bag to fall into the hydrogen peroxide. Be sure to point the neck of the bottle up and in a safe direction.
- Within a few seconds, an exothermic reaction in the bottle will produce a large amount of oxygen gas and water vapor that will form an impressive cloud as it escapes from the bottle.
