Imagine picking up an egg, and feeling something rubber instead of the hard shell. You are feeling the egg’s membrane! Let’s have some fun with colors and peel back the egg shell using science.
- Small Jars
- Food Coloring
What to Do
- Place 1 egg inside a glass jar (you can experiment with boiled eggs too!)
- Pour vinegar into the cup until the egg is completely covered.
- Add a few drops of food coloring to the glass.
- Notice the bubbles that have formed
- Let the mixture sit for 2 days, changing the vinegar and food coloring once a day.
- After 2 days, remove the egg, it should feel like rubber! Rinse off the egg using water.
- Have Fun! Be cautious because the egg is fragile and may break if handled roughly.
Why does this work?
An egg shell is made out of calcium carbonate which has the potential to be dissolved by a weak acid. Vinegar is an acetic acid, meaning a weak acid, and dissolved the egg shell until only the egg membrane was left. A membrane uses pores to let water through, and that is why the egg appeared larger after 2 days.