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Food Science Science Fair Project

Make Your Own pH Indicator

Make Your Own pH Indicator | Science Fair Projects | STEM Projects
With this project, you'll learn how to make your own acid/base indicator using red cabbage. Boil the cabbage and use the juice to test different fluids and observe the color changes.


The hypothesis is that the cabbage juice will turn pink in acidic solutions and green in basic solutions.

Method & Materials

You will grate the cabbage, boil it in water, strain the liquid, and make up some test acid/base solutions.
You will need a half head of red cabbage, a metal grater, a pot, a strainer, and some acid/base solutions.


Through this experiment, you will observe that the cabbage juice turns pink in acidic solutions and green in basic solutions. You can also use the indicator on other solutions of interest or dry it on coffee filters to create a simple form of "pH paper."

Why do this project?

This science project is unique because it allows students to make their own acid/base indicator using a common vegetable.

Also Consider

Experiment variations to consider include testing different types of vegetables to see if they can be used as indicators, or testing different types of solutions to see how the indicator reacts.

Full project details

You can find additional information and details for this science fair project here. Have fun exploring!

Related video

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