Today we have an experiment in the gas carbon dioxide.

In this experiment you can blow up a balloon by mixing vinegar and baking soda. The chemical reaction will produce carbon dioxide and rise through the bottle and into your balloon, causing it to “magically” blow up. Your children will be thrilled and amazed. Allow them to do as many steps on their own as they can. Remember to dress for mess for this one, and you might consider doing this experiment outside as it does tend to get messy.

Begin by stretching a balloon, pre-filled with  baking soda, over a clean, plastic water bottle in which some vinegar has been added. Tipping up the balloon causes the baking soda to mix with the vinegar and the resulting reaction gas pumps up the balloon.
Balloons expand to different extents depending on how much carbon dioxide gas is produced and this depends on the quantity of baking soda and vinegar used.

  • Place 1 teaspoon baking soda in the balloon.
  • Add 4 tablespoons of vinegar into a 1 liter water bottle.
  • Stretch the mouth of the balloon over the mouth of the bottle then turn the balloon completely upright so that the baking soda inside the balloon pours into the vinegar.

Compare the size of this balloon to one expanded with:

  • only half the amount of baking soda and vinegar or
  • half the amount of baking soda added to the same amount of vinegar.

Skip from scientific to artistic. Learn how to make balloon animals with this how to book.