Home > Random Stuff > Bouncy Eggsperiment


By Ruth Barnard


In this experiment you will turn one whole uncooked egg into a

bouncy rubbery egg.



What you need:

• One egg

• White vinegar

• One jar


What to do:

1. Carefully place the egg into the jar, cover the egg with vinegar and then leave it for at least 24 hours.

2. After at least 24 hours, take the egg out of the vinegar carefully by pouring the vinegar out and catching the egg in your hand.

3. Wash the egg under a tap while gently rubbing off any excess bits of shell to reveal your bouncy egg. If some of the shell won't rub off then cover it with fresh vinegar and leave it for one more day.

4. Try dropping your bouncy egg onto a table just a few centimeters in the air and see how it bounces like a bouncy ball, shine a torch light through it and see the yellow yolk and look below for more eggsperimental ideas. 




Why does the eggshell dissolve?

Soaking the egg in vinegar starts an acid-base reaction. Eggshell is mainly made of calcium carbonate which is a base and the vinegar is an acid. This reaction makes the eggshell dissolve.

The acid base reaction produces calcium acetate, water and carbon dioxide. The bubbles you see on the eggshell in the vinegar is a sign of the carbon dioxide you have created.


What keeps the egg together without its shell?

When you have washed the shell off your egg, the only thing keeping the raw egg inside is the eggs membranes. There are two membranes in an egg, an outer and an inner membrane, they are made of proteins and protect the inside of the egg from bacterial infections. The membranes are very thin and can easily be broken but it is stretchy enough to let your egg bounce from a small height.

Yolk and Albumen

If you look through the membranes you will be able to see the egg white (albumen) and the yolk. The albumen gives protection and protein to the embryo and is made up of 90% water and also consists of proteins. The yolk is the embryo's main source of nutrition proteins, vitamins, minerals, fat and water.

Grow and Shrink

Make your bouncy egg bigger by putting it in a glass of water for a day.

Why does the egg get bigger? The water passes through the membrane and into the egg to keep the amount of water on the inside and outside the membrane equal. For the same reason, you can shrink your egg by putting it in a liquid like corn syrup which has low water content.

Top Tip: Making the water a different colour makes it easy to see if the liquid has passed into the egg when we break it.


To show that the egg really is still raw you can break the membrane and see the raw egg spill out. Make sure you have a mat or plate underneath first and then examine the broken membrane for yourself and see how stretchy it is. You can also tear it and look closely to see that there are two membranes.

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