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Why does cabbage extract work as a pH indicator?
When anthocyanin comes in contact with the hydronium ions in an acid it turns pink, and when it comes in contact with the hydroxide ions in a base it turns blue or green. We refer to cabbage juice as a pH indicator because it can tell us if a substance is acidic or basic by changing colour.
Why purple cabbage can be used as an indicator?
Red or purple cabbage has a water-based pigment in its dye called anthocyanin. This fancy pigment can be used as a pH indicator! It reacts by changing colour in acidic and alkaline environments. This beautiful purple liquid will change to bright pink in acidic environments and green in alkaline environments!
What happens when you add acid to cabbage juice?
Cabbage juice turns pink when you add an acid, such as vinegar. It turns blue, or even green, when you add a base, such as baking soda. A chemical reaction occurs when an acid and a base are mixed together.
How does cabbage juice measure pH?
To use your pH indicator, pour about 2 teaspoons (10 ml) of each test substance into a separate Dixie cup. To each cup, add approximately 1/2 teaspoon (2 ml) of cabbage juice indicator. Now watch for the color changes! If the substance is an acid (i.e. lemon juice), the indicator should turn bright pink.
What makes Flavin act as pH indicator in our experiment?
Red cabbage juice contains a natural pH indicator that changes colors depending on the acidity of the solution. The pigment in red cabbage that causes the red color change is called flavin (an anthocyanin). At a lower pH, more hydrogen ions are in solution, and therefore the solution is acidic.
Is cabbage alkaline or acidic?
Fresh vegetables Like fruits, vegetables are also considered alkalizing and can help reduce acid levels in the body. Here is the PRAL for a 3.5-ounce (100-gram) serving of some common vegetables ( 4 ): white cabbage (raw): -1.5.