Thursday, January 20, 2011

Experiment - Calcium in Teeth /eggshell


Of recent I've been trying to be more pro active with doing Science Experiments REGULARLY with my Lil Muallims. This made me think I should also record and share them here one by one Inshallah. So keep checking. I hope to post one experiment in detail every 1-2 weeks Beidhnillah.


Last week we did a fascinating experiment. It was awesome....Subhanallah. The experiment tied in with two different topics being covered by the kids. This one was for Lil Muallim # 1

  "Calcium in teeth"

To find out how acidic and carbonated drinks effect our dental health.

Materials Needed:
An egg
Clean glass wide necked bottle

vinegar coffee maker
Regular white vinegar


How will the vinegar (acid) react with the calcium in the eggshell. Will it effect it in anyway?


  1. Place the egg carefully in a glass bottle. 
  2. Pour vinegar until it is completely immersed in the vinegar
  3. close the bottle and leave for 3 days


Immediate: Bubbles form around the eggshell. They look like the bubbles of  carbonated drink poured in glass.

 Our pictures didn't come out well.. will try again next time

Discuss Reason: When calcium carbonate (the egg) 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. (source)

DAY 1: Bubbles still surround the egg. Try touching the egg shell after a day. It will be soft and squishy. Don't press hard.

Discuss Reason: The chemical reaction keeps happening until all of the carbon in the egg is used up -- it takes about a day. 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. (source)

For older kids: When you submerge an egg in vinegar, the shell dissolves. Vinegar contains acetic acid, which breaks apart the solid calcium carbonate crystals that make up the eggshell into their calcium and carbonate parts. The calcium ions float free (calcium ions are atoms that are missing electrons), while the carbonate goes to make carbon dioxide—the bubbles that you see. (source)

DAY 2: Bubbles have reduced a bit but are still present. 

DAY 3:  Follow the steps:

Step #1: Remove the egg from the bottle gently. It's quite squishy on touch. Gently rub your fingers on the egg. Powdered calcium rubs off on our fingers showing the inner membrane of the egg. Subhanallah!

Step # 2: Rub off all the calcium until all is removed revealing the inner membrane of the egg. You can do it in a bowl of water or under gently running tap water.

Step # 3: Hold the egg an inch above the table and gently let go. The egg will bounce. Subhanallah!


Drinking a lot of carbonated drinks can make our teeth weak as they react with the calcium in our teeth and damage its enamel. (besides the fact that they are not good for health).

Watch Video of Bouncy Egg


There are other version of this experiment too. Will be posting them too soon as we do them.


1 comment:

George Quirk said...
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