Our second mind-blowing science experiment was dubbed “Color Changing Liquids,” an experiment you can easily do at home without special equipment. Our science kit included red cabbage juice powder, which we added to two separate cups of water to create a purplish-colored indicator (a substance that changes color when mixed with an acid or base). To make your own indicator, simply shred some red cabbage and soak it in water overnight. Strain it the next morning, and you are ready to test!
To our first cup, we added citric acid (you could use vinegar), which turned the liquid red. To the second liquid, we added baking soda, which turned the liquid blue, indicating a base. Then, we mixed the two liquids together. The acid and base neutralized each other, creating a purple liquid and released carbon dioxide just like in the “dancing powders” experiment.
Steve Spangler Science has some variations on this experiment. These include ideas for other acids and bases to test and how to create your own pH test strips from red cabbage juice. Enjoy!