This is easy! Fill a glass (clear is best) with enough vinegar to cover an egg. Then, carefully place a hard boiled egg in it and watch what happens.
Bubbles form on the eggshell. Eventually after a few days (we forgot about it till after 4 days), the egg will be naked! The whole shell disintegrates. It's so neat.
Some things to note when the experiment first begins:
*Density of the egg - does it sink or float?
*What's changing in the egg to make it float? How long does that take?
We have another experiment in the works with a raw egg. I saw it on Pinterest (though the link to the blog posting was broken). It's in day 2 and the shell is getting thinner and thinner. It would be interesting if we could see inside of an egg. I'll let you know how it works.
J quote from this experiment: "What's going to happen? What's going to happen?" He's such a little scientist.