Home | Portal | Blog | Forum | Media & Events | Submit Photo/project | Opportunities | Donate | Our Collaborators | Contact

Featured Project

  • Biogas Plant (ARTI Biogas) Construction and Gobar gas Production
    Biogas Plant (ARTI Biogas) Construction and Gobar gas Production The compact biogas plant DIY Digester Project: Biogas Production Plant Construction Note Biogas or Gobar Gas Plant is design by Appropriate rural of technology institute…
  • Fossil in marble
    Fossil in marble Experiment Level Elementary Introduction Fossils are some living things remains which lived long time ago and are extinct now. These are bones, shells and marks…

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

  • Hovercraft made by PSC Members in 2006 Hovercraft made by PSC Members in 2006 at Srfaraz pilot[…]

IEEE Karachi Section Workshop and Science Fair