Carbon Dioxide Balloon

1.  Pour some vinegar into a plastic bottle.  
2.  Pour a scoop of baking soda through a funnel into a balloon.
3.  Stretch the balloon over the mouth of the bottle.
4.  Dump the content of the balloon into the bottle and watch what happens!

When the baking soda and vinegar are combined, a chemical reaction takes place in which Carbon Dioxide (CO2) gas is released.

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