Posted by Dr. Walt on December 29, 2012 at 17:49:33 from (12.2.223.79):
In Reply to: O/T Chemistry experts posted by Fritz Maurer on December 29, 2012 at 10:00:13:
First, get some large "Party Balloons", NOT the cheap "penny balloons". Next you'll need a can of Draino Crystal Drain Cleaner, a heavy wall glass bottle such as the old hour-glass style Coke bottles, some heavy duty Aluminum Foil, and a wad of cotton.
Put three Tablespoons of Draino (crystaline Sodium Hydroxide / Potassium Hydroxide & Aluminum granules) into the bottle. Next take a 6" x 6" piece of heavy duty Aluminum foil and stuff it into the bottle. Then add 2 ounces of water to the bottle (no more or you will drown the mix), and quickly stuff the cotton into the NECK of the bottle (this keeps the water in the bottle but lets the Hydrogen pass through), and quickly stretch the neck of your balloon over the mouth of the bottle.
After the chemical reaction (caustic alkali attacks and dissolves Aluminum giving off copious quantities of Hydrogen gas, the Aluminum ions combine with the Oxygen molecules from the water and some of the Hydrogen molecules to form Aluminum Hydroxide) has finished, tie a piece of string tightly around the neck of the balloon BEFORE removing it from the bottle.
Be careful handling the bottle, the chemical reaction is an EXOTHERMIC reaction which means that it generates HEAT and the bottle will be hot.
When I was in Jr. High School back in the late 50's & early 60's , my friends & I would do this quite often.
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