Year 3 - Science Club
This week in Science Club we conducted a really cool experiment! It's called the "Naked Egg" experiment. Strange? We know!
This experiment is a classic acid-base reaction. Vinegar contains acetic acid. Eggshells contain calcium carbonate, which is a base.
The calcium carbonate in the eggshell reacts with the acetic acid in the vinegar to form a water-soluable compound, calcium acetate, and carbon dioxide (CO2) gas. This reaction dissolves the eggshell, but leaves the inner membrane intact, creating a naked egg.
When you first add the vinegar to the egg, if you look closely, you can see the reaction happening right before your eyes! Tiny bubbles of carbon dioxide gas (which is the same gas that makes fizzy drinks all fizzy) start to appear on the eggshell after just a few moments.
Here's how to do it at home!
What Do I Need? .
• a few eggs
• white vinegar
• a container big enough to hold all your eggs and a cover for the container
• a big spoon
What Do I Do?
Here’s how you dissolve the shell from your eggs:
1. Place your eggs in the container so that they are not touching.
2. Add enough vinegar to cover the eggs. Notice that bubbles form on the eggs. Cover the container, put it in the refrigerator, and let the eggs sit in the vinegar for 24 hours.
3. Use your big spoon to scoop the eggs out of the vinegar. Be careful—since the eggshell has been dissolving, the egg membrane may be the only thing holding the egg together. The membrane is not as durable as the shell.
4. Carefully dump out the vinegar. Put the eggs back in the container and cover them with fresh vinegar. Leave the eggs in the refrigerator for another 24 hours.
5. Scoop the eggs out again and rinse them carefully. If any of the membranes have broken, letting the egg ooze out, throw those eggs away.
6. When you’re done, you’ll have an egg without a shell. It looks like an egg, but it’s translucent—and the membrane flexes when you squeeze it. Very cool!