Home | Blog | Forum | Membership | Volunteer | Submit | Career | Support Us | Our Friends | Login | Contact

Featured Project

  • How To Make Pulse Counter
    How To Make Pulse Counter How To Make Pulse Counter The rhythmical dilation of arteries produced when blood is pumped outward by regular contractions of the heart, especially as palpated…
  • How to Make an Ant Farm
    How to Make an Ant Farm How to make an ant colony (Formicarium) An ant farm also called formicarium its a container which is designed primarily for the study of ant…

Abdul - Google+

Purple cabbage pH indicator

Rate this item
(2 votes)
Purple cabbage pH indicator - 2.0 out of 5 based on 2 votes
Purple cabbage pH indicator Purple cabbage pH indicator Pakistan Science Club


Level Primary, Elementary



We use litmus, phenolphthalein and bromothymol blue as pH indicator. Instead of  them, we can make simple pH indicator by purple cabbage.


purple cabbage(one-quarter), kitchen knife, cooking pan, water, bottle, and electric heater or gas range




(1)Cut purple cabbage into small pieces.

(2)Put cabbages and water in the cooking pan.

(3)Heat it until the cabbages become colorless.

(4)Keep the color water in the bottle.

(5)Let’s confirm the color change in the various water solutions.

Heat it and make red color water solution.



Where does the color come from the purple cabbage?The purple color in purple and red cabbage comes from a class of pigment molecules called anthocyanins. It turns out that anthocyanins are found in flower petals, leaves (it makes them turn red in the fall.) and some fruits such as blueberries. Anthocyanins are plant pigments known as flavenoids and produce red, pink, violet and magenta colors in the various plant parts.One of the things that changes the color on anthocyanins is the level of acid or alkali (i.e., pH) around the molecule. Because the color of the anthocyanin is affected by the
pH of the environment, these molecules can tell you the pH of any substance.


Leave a comment

Make sure you enter the (*) required information where indicated.\nBasic HTML code is allowed.

Science Summer Camp

Latest Video

  • A creative man makes a glass horse A creative man makes a glass horse in two minutes.[…]