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Rubber Bouncy Eggs: Easy Kitchen Science For Easter

You just need eggs and vinegar for this fun at-home science experiment

By Kara Murphy, Macaroni KID April 12, 2022

The Easter Bunny might magically hide eggs at your house, but that's nothing compared to the magic your kids will think you're capable of when you show them how to bounce a "rubber" egg.

This at-home STEM fun is effortless and takes just two everyday kitchen items — white vinegar and an egg!

How does it work?

Eggshells are made from calcium carbonate. The vinegar dissolves the calcium in the egg's shell but not the membrane inside the shell. This leaves behind the transparent rubbery membrane — your bouncy egg! The vinegar soak also causes the egg to swell because the membrane absorbs some of the vinegar. 



Make this experiment even more interesting by using two eggs — one hardboiled and one raw — to see if there's a difference in the outcome.

A heads up: Bounce a raw egg too much, and it will go splat!

Ready to start your bouncy rubber egg experiment? Egg-cellent! Here's how to make a bouncy egg in your kitchen, just in time for Easter.

What You Need:

  • An egg (or two!)
  • Clear glass or plastic jar or bowl with a lid 
  • White vinegar

What You Do:

1. Place the egg(s) gently in your glass jar or bowl. 

2. Fill the jar or bowl with enough vinegar to cover the egg(s) entirely.



3. Cover the container.

4. After just a few minutes, you will see the vinegar reacting with the eggshell in the way of tiny bubbles covering the egg.



5. After 2 or 3 days (you'll know they're ready when the surface of your vinegar has a gross, scummy film on top) remove the eggs from the vinegar.

6. Rinse carefully with water.

7. Gently roll and bounce your "rubber" eggs. It will be a STEM Easter egg experiment to remember!

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