By Alex on Sep 15, 2018


Measuring pH with red cabbage

Experiments | Chemistry | Measuring pH with red cabbage
Measuring pH with red cabbage

About this science experiment

Red cabbage is red (well, purple) because of a chemical called anthocyanin. Anthocyanin has a special property that causes it to change colors in solutions with different PH levels.

This experiment is best suited for kids in grades 6 and up.


  • A red cabbage
  • A drinking glass
  • A cheese grater
  • Water
  • A bowl
  • A strainer
  • A teaspoon
  • A lemon
  • A knife
  • A bar of soap


  1. Using the cheese grater, grate some the red cabbage and place it into the bowl.

  2. Cover the cabbage with hot water from the faucet and let it sit for an hour. The liquid should turn dark purple or blue-purple.

  3. Once the water has cooled to a safe temperature, use the strainer to strain the cabbage-water mixture into another bowl.

  4. Once you've strained the solution, pour a small amount into three glasses.

  5. For the first PH test, cut a piece of the lemon and squeeze it into the first glass.

  6. For the second test, cut off a small piece of soap and stir it into the second glass.

  7. Now, compare both of these glasses to the third glass. Using the picture above, see if you can figure out the PH of each solution and which one is basic and which one is acidic. (Hint: a PH of 7 is neutral, anything below 7 is acidic, and anything above 7 is basic.)

Analysis and Conclusion

Hmm... it seems nobody's added a conclusion for this experiment yet. You can suggest one here.



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