How to make an egg shell disappear without touching it?
We love egg experiments on Science Sparks. We have investigated air pressure using eggs, we have transformed egg whites, tested how strong an egg shell is, and shrunk them but today is this is the simpliest but most effective experiment involving eggs!
Today we are going to how we can make an egg shell disappear without touching it!
You will need:
An egg
A glass
White vinegar
Method
1. Take a raw egg and put it in a cup
Cover with White vinegar
2. Cover it with white vinegar (which is also known as acetic acid)
Q: What do you noticing happening?
A: You should see bubbles collect around the shell (a sign that a chemical reaction is taking place)
3. Leave for 4 to 5 days.
4. Go to observe.
See the residue collect and the shell come away?
The whole egg in tact!
I should not have tried lifting it out!
You should now be able to see shell residue in the vinegar and the yolk whole in the egg white. If you still see white resdiue on the egg you can rub this off lightly with you finger. I tried to lift the whole egg out of the vinegar but broke the membrane, but it is possible to lift it out whole.
The Science Bit
The acid has reacted with the shell and “eaten” away at it. The shell is made up of calcium carbonate and this gets dissolves due to the acid. The inside of the egg should still be intact because the vinegar doesn’t break down the egg membrane. The egg also swells up, because some of the liquid seeps inside it via diffusuion (high concentration to low).You should be able to see the yellow yolk through the membrane. It really is quite incredible.
You could compare what happens to a raw egg with a boiled egg as well.
Go have a go and see through an egg!
Please Don’t forget to come and link up to Fun Sparks on Thursday
22 Comments
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wow I never knew that could happen, will be trying this at home.
Great! Let me know if you manage to keep the egg whole.
This is so cool! My kids will love this!
It is so easy and effective, but put is somewhere that you don’t mind the vinegar smell!
Very cool! you are my science star, i truely learn a lot from you!
Oh I love being called a star! Thank you very much. Glad you like it!
This is too cool!
Its fab isn’t it?
This is a great experiment! Beautifully photographed, too =)
Thanks you, I had some assistance this time.
Just hopped over from Kid’s Get Crafty Link up – Wow – What a great experiment. Thanks for sharing.
Ellie
thank you!
Well I never! So what does Vinegar do to our stomachs.. eeek!
Thanks for sharing on Kids Get Crafty!
Maggy
Luckily we have not got any calcium carbonate to react with and it contain hydrochloric acid in it anyway to digest food, so it is used to acids. x
this is SO cool! I’m going to share this with my blog’s FB followers. Thanks (as always) for sharing the coolest experiments!
This is a fun and simple experiment! I am going to do it here (while husband is away and doesn’t mind the egg floating around for 5 days). And now I am following your terrific site in Google reader.
thank you x
Cool and interesting. I love how smart you are! Thanks for sharing at Monday Madness. Hope to see you again tomorrow!
Thanks! Did this with my 5 & 3 year old. They loved to watch the shell dissolve, then handle the squishy egg. We extended the experiment, next soaking the egg in corn syrup (to draw out the water), then water tinted blue (which made the egg expand), then salt water (floating & dessicating). Finally broke it open to find a green yolk. We are starting it again this week — got to figure out what our soaking liquids will be.
I’ve tried this with boiled eggs before so the children can touch it to feel the difference. I’ll have to try a raw one too.
Just to make sure…can we still cook and eat the result? (Maybe not, but I wanted to ask.)
Thanks!
The membrane should have protected the inside of the egg
Not sure of the best way to cool it though!