![]() ![]() Want to know more about what exactly pH is? look here: Use this chart to help you figure out how acidic or basic your test liquids are: If there is no color change at all, the substance that you are testing is probably neutral, just like water. Some indicators start out colorless and turn different colors when they mix with an acid or a base. Red cabbage is just one of many indicators that are available to scientists. The pigment turns red in acidic environments with a pH less than 7 and the pigment turns bluish-green in alkaline (basic), environments with a pH greater than 7. What is it about cabbage that causes this to happen? Red cabbage contains a water-soluble pigment called anthocyanin that changes color when it is mixed with an acid or a base. Red cabbage juice is considered to be an indicator because it shows us something about the chemical composition of other substances. An indicator is typically a chemical that changes color if it comes in contact with an acid or a base.Īs you can see, the purple cabbage juice turns red when it mixes with something acidic and turns green when it mixes with something basic. For reference, water (which is neutral), has a pH of 7 on a scale of 0–14. Think of acids and bases as opposites-acids have a low pH and bases have a high pH. It can tell you whether something is an acid or a base, as well as how acidic or basic it is, based on how much the color changes. What you have made is called a pH indicator. (Be careful about mixing household cleaners together, as some combinations may produce harmful fumes. Gently stir or swirl the solution and see what happens!.Once it has cooled, pour some into clear cups or glasses and add different liquids to test. ![]()
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