1. Parenting

The Naked Egg Experiment

Why Does the Eggshell Dissolve?

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The Naked Egg Experiment
Photo: Amanda Morin

If you’ve already done the Egg in Soda Experiment and/or the Egg in Vinegar dental health experiment, your child may be ready to do an egg experiment that doesn’t make him fearful of ruining his teeth!

The Naked Egg Experiment is a great one to do. It still shows how acid interacts with calcium carbonate to dissolve an eggshell, but in the end you have a really cool naked egg. Plus, it’s very easy to do.

What You Will Need:

  • a soft-shelled (not hardboiled) egg

  • a clear plastic cup

  • vinegar

  • 48 to 72 hours

  • flashlight (optional)

What You Need to Do:

  1. Place a raw (not hard boiled) egg in a clear plastic cup or other container.

  2. Fill the container with white vinegar.

  3. Check on the egg in about 24 hours. You and your child should notice bubbles have formed on the egg and/or that there is a foam on the top of the liquid. The bubbles are carbon dioxide and the foam is some of the calcium (eggshell)that has dissolved.

  4. Pour out the vinegar and replace it with new vinegar. Leave the egg to soak for another 24 to 48 hours.

  5. After three or four days, use a spoon to carefully remove the egg from the container. By now the eggshell has likely completely dissolved, leaving behind a sort of egg water balloon, so you do not want to remove the egg with your hands.

  6. Rinse the egg gently with water.

  7. Shine a flashlight behind the egg. Since the eggshell has dissolved, all that left is the membrane. The egg should be translucent and nearly glow when the light shines through it.

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