How to Make a pH Indicator With Cabbage

Use red cabbage juice to make your own pH indicator.
••• Comstock/Comstock/Getty Images

Acids, like citric acids in citrus fruits, tend to be sour in taste while bases, like baking soda, tend have a bitter taste. But of course you can't taste everything to test if it's an acid! In school you may have used litmus paper to determine if a substance was an acid or a base. In this simple science experiment, you can make your own pH indicator, which tests to see if solutions are acidic or basic.

    Grate about 1/2 cup of red cabbage. It might help to first cut the red cabbage into quarters so it's easier to grate.

    Put the red cabbage in a bowl and add just enough water to cover it.

    Crush the cabbage with the wooden spoon to produce a purple cabbage juice.

    Sieve the cabbage juice into several small cups. This is your pH indicator solution.

    To determine the pH of the soap, vinegar, or an unknown substance, just add it to the cups. An acid will turn the solution pink, and a base will turn the solution blue.

    Things You'll Need

    • red cabbage
    • knife
    • bowl
    • grater
    • wooden spoon
    • vinegar
    • soap
    • sieve
    • cups

    Tips

    • Acids and bases cancel each other out, so try reversing the color change by adding the opposite solution.

Related Articles

Test Tube Science Experiments for Kids
How to Raise the PH Level in Water
What Turns pH Paper Green?
Test Tube Science Experiments for Kids
Bases Used As Common Household Products
How to Make an EDTA Solution
How to Make Simulated Stomach Acid
List of Acidic Liquids
Characteristics of Acids, Bases & Salts
Easy & Fast pH Experiments With Litmus
How to Mix Calcium Chloride and Water
How to Make Flash Paper
How to Use Baking Soda to Make Alkaline Water
How to Neutralize an Acid
The Properties of Acidic Substances
How to Turn a Glass of Water With Red Dye Back Into...
What Color Would a Tester PH Paper Turn if Is Dipped...
How to Make a Volcano Out of Cardboard
How to Test for Sodium Bicarbonate
If You Dilute Vinegar, How Will It Affect the pH Value?

Dont Go!

We Have More Great Sciencing Articles!