Balloon Blow-Up

Last week we mixed baking soda and vinegar in a bottle with a balloon on the top and watched the balloon blow up from the carbon dioxide that's produced. Some of the class wanted to know what would happen if we added more vinegar, so we tested this the next day. We put 1 cup of vinegar in a bottle, 2 cups in the next bottle and 3 cups in the last bottle. We added the same amount of baking soda to each one. The balloon on top of the 3-cup bottle popped off and the mixture flowed out of the top of the bottle. The other 2 balloons stayed on, with the 2-cup balloon getting the biggest. This told us that more vinegar = more carbon dioxide. This is another experiement that is easy and fun to try at home.