We did an eggcellent experiment in class this week. Each group put an egg in water and an egg in vinegar. We checked on the eggs each day for three days to see how they changed.
Within one hour we could see bubbles on the outside of the eggs in vinegar.
Why? This was the vinegar reacting with the calcium carbonate in the egg shell and it released carbon dioxide gas (that we could see as bubbles on the shell).
What else happened?
On the third day we took the eggs out of the vinegar and water. The ones in water remained the same but the shells on the eggs in vinegar starting going soft. When we rubbed them gently the shell started rubbing away completely. The eggs looked boiled but when we cut them open the were raw inside. The ones in water hadn’t changed at all.
Why? The vinegar caused a chemical reaction!
The acetic acid in vinegar dissolved the shell of the eggs by eating away the calcium carbonate. It released carbon dioxide gas and left calcium acetate, which is soluble.
It’s very simple. Try it at home! (Don’t blame us if you don’t like the smell of vinegar!!!)
We also went on an egg hunt in school. We found colourful eggs!
Happy Easter everyone.