Sunday, March 22, 2015

The bouncy naked egg experiment

With Easter right around the corner, Jack wanted to do the bouncy ,  naked egg experiment. We put an egg in a mason jar of water and we put another  egg in a mason jar of white vinegar.  We didn't  have a complete  mason jar , we had the jars with the hole at  the top for a straw. I didn't want the whole  house  to smell like vinegar so I put saran wrap on the jar before I put the lid on. We used brown eggs because that is all we had . Immediately  you could see the egg in the vinegar was bubbling causing a reaction and their was some brown residue at the top of the jar from the brown shell.

After 24 hours , the egg in water was slightly  cracked and little of the egg white  was floating  in the jar.  I took the egg out of the vinegar and rinsed it gently under water and rinsed out the jar and replaced it with fresh vinegar,  then I placed the egg back in the jar. You could tell it was already rubbery but still had a little shell left on it. Then  I  soaked them for another  24 hours.

On the third day we took the egg out and observed them.  The egg in water was like a normal egg. The bit  of egg white that leaked  out had the consistency  of jelly.
The vinegar egg was awesome , it had swollen in size , was rubbery , see through and bouncy (up to about 6 inches).  When it finally did break and you could feel the rubbery membrane, it felt like a balloon.
While we were patiently  waiting on eggsperiment , we had a park day  with some friends  and had a family dinner with Jack's  cousins  over.

The Science Behind it:

The shell of the the egg is made of calcium  carbonate. When you place an egg into vinegar,  it starts to bubble , which is the chemical  reaction of the acid in the vinegar reacting with with the calcium carbonate  producing carbon dioxide.  You'll  also notice  that the egg gets larger as it sits in the vinegar. That is because some  of the vinegar is absorbed in the egg through  its semi-permeable membrane. Jack said the egg smelled like vinegar when it broke too.

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