Kids Science – Coloured Eggs
This is a cool science experiment for kids, to create coloured, shell-less eggs (the eggshell dissolves in the vinegar). It is a classic acid-base reaction. A chemical reaction takes place when the calcium carbonate in the eggshell reacts with the acid in the vinegar. This reaction dissolves the eggshell, but leaves the inner membrane intact, creating a naked egg. So what happens is that the eggs will be without a shell, and beautifully coloured with the food colouring. Adult supervision is required with this experiment. The eggs must not be eaten.
MATERIALS YOU NEED:
Glass Jars with Lids
WHAT TO DO:
Put each raw egg in a jar with a wide mouth. Hold the jar on its side and use a spoon to place the egg carefully inside.
Fill each jar with enough vinegar to fully submerge the egg. Add several drops of food colouring to each jar and stir carefully. (The egg will start to float at first, but will sink later on). Put on the lid.
Bubbles will start to form on the shell (carbon dioxide bubbles on egg shell in vinegar). Place the jars with the vinegar and egg in a safe place for 7 days. One week (7 days) later, carefully pour off the vinegar, remove the egg, then wash the egg with water and gently wipe off any remaining eggshell.
Now you have eggs that have changed colour and are shell-less (naked)! And, when held under a torch or other light source, the eggs are transparent!