Dissolving, Expanding, Bouncing Egg Science Experiment

Out of all the egg science experiment you can do dissolving egg shells should be at the top of every child’s to do list. It’s a great visual and tactile STEM project to do at home and there are quite a few things that you can talk about with the kids.

In fact it should be on every parents to do list if you haven’t done it yet!

You want at least two clear glasses. One to add vinegar to (white is better visually but you can use dark vinegar) and one to add water to. The water is the control substance that will do nothing to the egg and keep it exactly the same. If you have enough glasses and the ingredients you can also use a glass of fizzy drink (we used coke) and a glass of fresh fruit juice (we used orange juice).

Dissolving Egg Science Experiment

Place the same sized egg in each glass and cover with each of the liquids you’re using.STEM Egg science experiment

The vinegar will start to react straight away producing loads of bubbles as the calcium carbonate in the shell is dissolved by the acetic acid producing carbon dioxide.

We left the eggs for 24 hrs and when we looked found  …

  • The water hadn’t done anything
  • The coke had surprisingly dissolved very little.
  • The orange juice had dissolved quite a bit
  • The vinegar had dissolved loads

Dissolving egg shell egg science experiment

We put the eggs back in their liquids and left for a further 12 hour and found …

  • The water still hadn’t done anything
  • The coke had dissolved a little but more.
  • The orange juice had dissolved quite a bit more
  • The vinegar had dissolved all of the shell

Egg Science Experiment

Membrane Egg Science Experiment

Now what you may have noticed is that the egg with no shell is also a LOT bigger than the control shell. This is because the membrane around the egg is semi permeable.

Whilst it was in the vinegar the liquid moved through the membrane into the egg resulting in the membrane swelling and increasing in size.

When you hold the egg with no shell it will feel damp to the touch and that’s because the liquid is starting to seep back out through the membrane. You can see this really well if you put the shell-less egg on some kitchen roll. The liquid in the shell will soak into the kitchen towel through the membrane.

Bouncing Egg Science Experiment

And there’s more!

The egg without it’s shell and now full of extra liquid, will bounce!

But how high will it bounce?

We cut lengths of wool approximately 10cm in length to hold up as a guide to height. How high do you think we got?

If you loved this egg science experiment then do check out my other Science AT Home Posts for some more fun things to try.

 

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23 Responses to Dissolving, Expanding, Bouncing Egg Science Experiment

  1. OMG- they are mini-yous!

  2. I think that we bounced ours at the 24 hour mark so they were still robust enough to bounce about 30 cm? We had one egg and all three of us bounced it successfully.

  3. Resh says:

    egg-celent! :) Definitely want to try this out. thanks for sharing on G+
    -Reshama
    http://www.stackingbooks.com

  4. The girls are so cute. I love it when the eggs break and they weren’t expecting it! 😀

  5. Emma says:

    Love these, and thanks for linking up to our challenge.

  6. Natasha says:

    Do you have to use brown eggs or white ones

  7. Donna klipa says:

    Do you use raw eggs or hard boil them??

  8. lily says:

    i really like this project i could proberly (i already know i spelt it wrong) do this every day.

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  11. Shay says:

    How do you make a graph and table from this experiment?

    • BlueBearWood says:

      It depends what your trying to capture … so you could do
      time v. % shell dissolved or membrane showing for each egg/ liquid (line diagram
      liquid v. % shell dissolved (bar graph)
      A table would be better as you could also mention colour change assuming you had the same coloured eggs in each liquid

  12. nubia garcia says:

    I have a question , did you use organic eggs or normal eggs

  13. Guess Who I Am says:

    Use this for science fair, this is cool, hope to get a good grade:)

  14. Ellen Braithwaite says:

    Oh we loved watching this experiement so much. We – my 4 boys aged 4 – 13 yrs – laughed so much…just like ‘school’ at ours.
    We did the experiment to, but I accidentally dropped the egg in the sink and it burst so we never got to test the bouncing which the boys were dissapointed by.
    Thanks for sharing.

    • BlueBearWood says:

      Sounds like you had great fun doing it even if you didn’t get to bounce it … a good excuse to have another go. It’s one of our favourite and I’ve got another version set up to do over Christmas!

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