Indicators

In this video, I show two different indicators. An indicator is a substance that changes color in acidic or basic conditions. There are natural indicators like red cabbage, blueberries, tea, hibiscus, and others. I am investigating red cabbage. Then, there are synthetic indicators like bromothymol blue (BTB) and phenolphthalein. I am investigating BTB. If you want to learn more about indicators, acids, bases, salts, and the pH scale, you can read the book "Kemi 7" available on Apple Books by Kaj Schmidt