How much foam can you get from one egg?
Warning! Only under adult supervision.
- pumpkin-shaped candlestick;
- 25 g (1 Tbsp) baking soda (sodium bicarbonate);
- 75 mL (7 Tbsp) white vinegar (acetic acid solution);
- food coloring;
- wooden stick.
Separate an egg’s white from its yolk and pour the white into a pumpkin-shaped candlestick. Add baking soda and stir with a wooden stick. Mix some vinegar and food coloring and add the mixture to the candlestick. Colorful foam bursts out of the pumpkin when the mixture is stirred with the wooden stick!
Sodium bicarbonate and acetic acid react to form gaseous carbon dioxide. As it emerges, the gas is trapped by the relatively thick egg white, thus frothing the mixture. You can use different food colorings to make foam with all sorts of different colors!
A similar experiment is included in the “Chemistry of eggs” set from the MEL Chemistry subscription.