Self Inflating Balloon

Self Inflating Balloon
Watch as the balloon seemingly comes to l ife on its own and inflates itself. It's an amazing chemical reaction at work.

Objectives:
  • Demonstrate the power of gas produced when the baking soda mixes with the lemon juice.
  • Blow up a balloon with the created gas.


Experiment Details:
  • Type: Chemistry
  • Grades 4-7
  • Difficulty of Project: Easy (Level 2)
  • Cost of Completing Project: $5
  • Approximate Time: Less than 5 minutes

What You'll Need
See Video Below!
  • Balloon
  • ¼ cup of water
  • Empty water bottle 12 oz.
  • Drinking straw
  • Bowl
  • Juice from one lemon
  • 1 teaspoon of baking soda
  • Funnel


Step-By-Step Procedure
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STEP 1:
Take a balloon. Carefully stretch it out so that it will inflate easily. Be sure not to rip it in any way.

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STEP 2:
Pour ¼ a cup of water into a bowl.
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STEP 3:
Add one level teaspoon of baking soda and agitate (swirl) it until it is completely dissolved. Use the drinking straw to stir it if needed.
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STEP 4:
Add this mixture to the water bottle with the funnel.
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STEP 5:
Pour the lemon juice in.
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STEP 6:
Quickly stretch the balloon mouth over the water bottle without ripping it.
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STEP 7:
Watch carefully as the balloon inflates.
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Observation & Conclusion
The reaction between the lemon juice and the baking soda solution is one that creates a great deal of carbon dioxide gas. As the lemon juice and baking soda react, more and more of the gas is given off. As the gas accumulates, the balloon becomes bigger and bigger. In fact, if you added ¼ cup more of the baking soda solution, the balloon could explode if it doesn’t fly off of the water bottle!
Science Fair Questions
1. Would this reaction work with a different acid? Vinegar?

2. Would this reaction work with a different CO2 source?

3. Can this reaction also be done with fermentation?

Video Demonstrations
Self Inlfating Balloon