We love egg experiments here at Science Sparks. We’ve investigated air pressure using eggs, transformed egg whites, tested how strong an eggshell is, and even made eggs shrink. Today, however, we’re going to find out how to make an eggshell disappear. It sounds impossible, but it is actually very simple!
How to dissolve an eggshell
You will need the following:
White vinegar ( malt vinegar also works )
1. Place the raw egg in a glass or small bowl.
2. Cover the egg with white vinegar, making sure the whole egg is covered.
Q: What do you notice happening?
A: You should see bubbles collect around the shell (a sign that a chemical reaction is taking place)
3. Leave for 24 hours.
4. Rinse the egg and place it back in the vinegar if any shell still remains.
You should now be able to see eggshell residue in the vinegar and the yolk whole in the egg white. If you still see white residue on the egg, you can rub this off lightly with your finger. I tried to lift the whole egg out of the vinegar but broke the membrane. However, it is possible to lift it out whole.
Make an eggshell disappear – what happens?
Eggshell is made up of calcium carbonate, which is dissolved by acids ( in this case, vinegar ). The inside of the egg remains intact because the vinegar doesn’t break down the egg membrane.
The egg will also swell up because some of the liquid seeps inside it via osmosis. You should be able to see the yellow yolk through the membrane. It really is quite incredible.
You can use the same method to make a bouncy egg.
Last Updated on June 7, 2023 by Emma Vanstone