![]() Using red cabbage as a pH indicator works well for an activity with mixed-age groups because each age may achieve a different level of understanding. Even if you have done it before, pull it out again and try something new with it. If you haven’t done this, it really is fun. I know, I know, red cabbage indicator is all over the Internet and has been probably over-exposed, but that is because it is easy and works for both acids and bases. A nthocyanins- derived from red or purple fruits and berries, such as: red cabbage! Pool supply and aquarium supply stores may also carry it.Ģ. Litmus paper is available online or in science supply stores. If neither changes, the substance you are testing is neutral. ![]() If the red (pink) litmus paper turns blue, it is a base. If the blue litmus paper turns red, it is an acid. All you need to do is dip the litmus paper strip into the liquid to be tested. Litmus paper is a classic for exploring acids and bases. Litmus is a complex of dyes extracted from certain lichens. Examples of pH indicators from plants include:ġ. Label each container when you add a substance to be tested so you remember which is which.Ĭertain molecules and substances change color when exposed to specific acidic or basic conditions, and thus can be used as pH indicators. Gather small clear containers such a plastic cups or clean baby food jars to carry out the experiments in. Also, adding vinegar to baking soda is fine, but do not mix strong acids and bases. Note: Bleach doesn’t work well because it interferes with the dye molecules.
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