Science at Home: Blowing Up Balloons With CO2

Science at Home: Blowing Up Balloons With CO2

Exploring chemical reactions? Let’s try a CO2 home experiment. Make use of the carbon dioxide given off by a baking soda and lemon juice reaction by funneling the gas through a soft drink bottle and into your awaiting balloon!


What you’ll need:
  • Balloon
  • About 40 ml of water (a cup is about 250 ml so you don’t need much)
  • Soft drink bottle
  • Drinking straw
  • Juice from a lemon
  • 1 teaspoon of baking soda
  1. Before you begin, make sure that you stretch out the balloon to make it as easy as possible to inflate.
  2. Pour the 40 ml of water into the soft drink bottle.
  3. Add the teaspoon of baking soda and stir it around with the straw until it has dissolved.
  4. Pour the lemon juice in and quickly put the stretched balloon over the mouth of the bottle.
What’s happening?

If all goes well then your balloon should inflate! Adding the lemon juice to the baking soda creates a chemical reaction. The baking soda is a base, while the lemon juice is an acid, and when the two combine the chemical reaction creates carbon dioxide (CO2). The carbon dioxide rises up and travels through the soft drink bottle and into the balloon, pushing it outwards and blowing it up. If you don’t have any lemons then you can substitute the lemon juice for vinegar.



How did yours turn out? Send us a picture or video of your CO2 home experiment to and we’ll feature it on our blog for the #NoniTribe


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