Thursday, March 29, 2012

Disappearing Egg Shell

I have been seeing the disappearing egg shell experiment floating around on pinterest for some time now and I wanted to give it a try.

  • Vinegar
  • Egg*
  • Cup or Glass
*(You could use raw or hard boiled. Hard boiled would be less messy less messy but what fun is that?)

Set the egg inside your glass and fill it with vinegar until it is covered. If your egg floats and some of it pops above the surface that is fine. 

Notice the bubbles?

After 24 hours carefully take the egg out and examine it.
The egg should be soft a squishy. 

Careful not to squeeze too hard!!

If any of the shell is remaining you should be able to carefully rub it off. 

You can barely see the yolk!

It also grew in size (or as my 4 year old said - "It ballooned!")

What happened to the shell?

Egg shells contain something called "calcium carbonate".  This is what makes the shell hard.
Vinegar is an acid known as acetic acid.
When calcium carbonate (the egg shell) and acetic acid (the vinegar) combine, a chemical reaction takes place and carbon dioxide (a gas) is released.  This is what the bubbles are made of.
The chemical reaction keeps happening until all of the carbon in the egg is used up .
When you take the egg out of the vinegar it's soft because all of the carbon floated out of the egg in those little bubbles.

I will be linking up to THESE fun parties.
Be sure to check them out and get inspired.


  1. oh wow - I came across to look at something else - but this looks pretty amazing _ my girls would love to try this out!

    1. Thank you so much for stopping by!! Hope your girls enjoy this as much as mine did.

  2. I saw that too and wondered about that...glad to see that it works. Might have to try that sometime soon. Thanks for sharing on Hey Mom, Look What I Did at Adventures In Mommy Land!! Hope to see you again soon :)

  3. This is such a great activity - thank you so much for linking up to Tuedsay Tots and just popping by to let you know that I am featuring it this week on my Science Themed features at Rainy Day Mum

    1. How exciting!! Thank you so much for the feature. I'm heading over to see it now.

  4. That is crazy, a bit gross and a whole lot of fun! The preschool class at my work would get a kick out of this!! Thanks so much for sharing and I am a new follower!!
    Hope you have a great day!

    1. It was a little gross but pretty cool at the same time. The kids loved to poke at the egg.

  5. I am featuring this tomorrow on Tuesday Tots! Thanks so much for sharing it with is. I just love this experiment, and can't wait to try it!

  6. oh wow!! really.. I've never tried this... wow!! sounds interesting.. Huummm... Thank you for linking into Made with Love :)