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


    • 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
How to Make an EDTA Solution
How to Calculate the PKA in Titration
Test Tube Science Experiments for Kids
How to Make a Volcano Out of Cardboard
How do I Calculate the Amount of Acid to Reduce Water...
The Properties of Acidic Substances
Characteristics of Acids, Bases & Salts
Easy & Fast pH Experiments With Litmus
Bases Used As Common Household Products
How to Make Simulated Stomach Acid
How to Test for Acidity With Litmus Paper
List of Acidic Liquids
What Color Would a Tester PH Paper Turn if Is Dipped...
What Turns pH Paper Green?
How to Test for Sodium Bicarbonate
How to Calculate the pH of Lemon Juice
The Common Uses for Tartaric Acid
What Is the Function of Litmus Paper?

Dont Go!

We Have More Great Sciencing Articles!