Eggshells are no match for acetic acid in this rubber egg experiment. All you need is an egg, vinegar, and a bowl.

This is why the egg swells in size during the experiment. The discoloration in the vinegar and floating material you see is calcium acetate - a product of the chemical reaction. How long does it take ...

There's no reason for this experiment not to work other than your egg hasn't been left in vinegar for long enough. After a few days press on the egg and if the shell is still hard, give it more time.

What do you observe? The eggshell and the antacid tablet shouldn’t do anything interesting in the water but they should cause bubbling in the vinegar. Cover your work surface with newspaper or paper ...

Step 8: Look at the egg in vinegar next. You might see it is covered ... should be drastically different to the other eggs in the experiment.