Red Cabbage Experiment
Experiments with purple cabbage
Today, I want to conduct a wonderful experiment with purple cabbage as material. Purple cabbage is common in the city, but few people know its secrets.
Take a purple cabbage first, choose a few leaves, wash and cut it, put it in a kettle, add an appropriate amount of water, and cook it over fire. Soon, the color of the water gradually changed, showing a dark purple shape. This is the juice of purple cabbage dissolved in the water. When it is slightly cool, pour it into a bowl and set aside.
Find all kinds of objects, including white vinegar and soda ash, and prepare several cups. One cup is filled with a little white vinegar, and the other cup is filled with a little soda ash. Add water and stir it to dissolve.
is to take the prepared purple cabbage juice and drop it into the cup containing white vinegar and soda ash water respectively. See the juice dripping into the white vinegar cup, instantly reddening, just like the beauty of peach blossoms in spring; while the juice dripping into the soda ash water cup turns green, just like the green of young leaves in summer.
What is the principle of this? Gai purple cabbage juice contains special substances. When it encounters acid, it will be red, and when it encounters alkali, it will be green. It can be used as a simple acid-base indicator. From this perspective, everyday things also hide the wonders of science. Only by exploring with heart can we know the wonders of nature.
