100 Days of Science #54-- Fluoride and Calcium Experiment

We have soaked an egg in vinegar before to make a "bouncing" egg like many Pinterest photos show but I was intrigued with the idea of taking the experiment one step further.  

We read that if you coat one egg in a fluoride toothpaste first that the fluoride will protect the shell for the acidic vinegar and keep it from breaking down as fast. 

We thought it sounded like the perfect experiment to try!.  We got out two eggs, two small mason jars (with lids) and a tube of toothpaste. 

First we smeared toothpaste all over one egg and then set it aside to dry on the counter for 24 hours. 

The next morning we rinsed off the toothpaste egg as best we could and with both eggs ready we poured 1/2 cup of vinegar into each mason jar.  We put the lids on and labeled the jar with the toothpaste egg so we'd know which egg was which.

Then we set them on the counter and observed them for the next two days.

We didn't see much difference in our observations at all.

After two days we unscrewed the lids and dumped out the vinegar.

With just a bit of gentle rinsing our non- toothpaste egg looked like this!

At first the boys thought the difference was rather remarkable but I reminded them that we had rinsed off the non- toothpaste egg and to keep our experiment true we had to rinse the toothpaste egg too.

It looked like this when we were done... and honestly if we had kept rinsing we could have washed all the white off I'm sure.  However, it was a bit thicker and seemed to be a bit more resistant to the vinegar.

I thought the results were going to be a bit more dazzling and I began to wonder if we should have used a thicker coat of toothpaste or not washed it off as thoroughly as we did.

Others in this series:
2.  Field Trip to the Ecotarium 
3.  Learning About Air Molecules


  1. Thank you for all of these ideas. Keeping science interesting in homeschool has been a challenge. :)

  2. This is so cool and such a fun experiment.

    1. It really was neat! I was skeptical that we were going to see any sort of difference but we did.


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