Our second experiment in our science kit used red cabbage powder (which looks purple), citric acid, and baking soda.
We put water in two cups, then added the cabbage powder to each and watched as the water slowly turned a very pretty purple.
M added citric acid to one of the cups, then baking soda to the other. The first one turned a pinkish red and the second one turned blue! The citric acid and baking soda are both white, so M did not expect the color change at all!
Then M had a little fun adding more citric acid or baking soda and watching the colors get darker or lighter. Soon he mixed them together and this started some pretty pink fizzing. :)
Of course, soon everything was dumped out into the tray together and M examined it closely:
Eventually I gave him a small cup of vinegar and a little bowl of baking soda. He kept scooping the baking soda into the tray, then he used a pipette to squeeze a little vinegar onto the baking soda piles. To quote M, this was “super-fun”! :)
Baking soda is a base, citric acid is an acid, and the cabbage powder is a neutral. The cabbage juice is a natural dye, and adding a base or acid to it will cause it to turn either red or blue.
For more science fun, check out Adventures in Mommydom!
Have a beautiful day! :)