A Homemade pH Indicator Experiment Red Cabbage Juice

Red cabbage contains a pigment molecule called flavin (an anthocyanin)

Red Cabbage Juice: A Homemade pH Indicator

WARNING do not drink any of the liquid.

I used 2 teaspoons (28g) for the sugar, baking soda, sanitizer, lemon juice. Make sure to stir until dissolved.

Red cabbage contains a pigment molecule called flavin (an anthocyanin). This water-soluble pigment is also found in apple skin, plums, poppies, cornflowers, and grapes.

Red cabbage juice contains a natural pH indicator that changes colors according to the a acidity of the solution. This is very easy to make and exhibits a wide range of colors.

You can make it a couple different ways, one by chopping up the red cabbage into strips adding 2 cups of hot water and then blending it and then pouring into a coffee filter. This is give you a dark purple indicator like I used.

Or you can chop up the red cabbage into strips and pour hot water with the strips (NO Blending). This will give you a dark blue color indicator. Both work.

Very acidic solutions will turn anthocyanin a red color. Neutral solutions result in a purplish color. Basic solutions appear in greenish-yellow. Therefore, it is possible to determine the pH of a solution based on the color it turns the anthocyanin pigments in red cabbage juice.

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16 thoughts on “A Homemade pH Indicator Experiment Red Cabbage Juice

  1. Also, are there any ways I can contact you in person? Because I will need some help with the experiment and some other calculations based off of this experiment. Please email me if you see this! My email: qq1326888741@gmail.com
    Thank you!!

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