Red Cabbage pH Indicator Experiment

pH test

Testing pH value of solutions and seeing the colour changes on pH indicator is an amazing learning activity. However, to do our Red Cabbage pH Indicator Experiment, you need to first make pH indicators with the help of red cabbage. If your pH papers are ready, you can test liquids to determine how acidic they are. pH is a numeric scale that is used in chemistry to specify the acidity or basicity of a water based solution. Let us use the cabbage papers that we had made during our past activity to perform some simple pH tests.

Try it yourself

You need:
  1. Cabbage pH papers
  2. Tap water
  3. Distilled water
  4. Soda water
  5. Vinegar
  6. Liquid detergent soap
  7. Shampoo
  8. Baking soda solution
  9. Lemon juice
  10. Beakers
  11. Camera (optional)
  12. Record sheet
  13. Sketch pens or color pens
What next?

Step 1: Pour liquids in different beakers.

Step 2: Insert cabbage pH papers and note the color changes on it. Do it with separate cabbage papers in each beaker.

Step 3: Use the camera to record the color changes.

Step 4: Use the sketch pen or color pens to draw matching colors on the record sheet to match with the liquid solutions. Give your conclusion.

A similar experiment we have done here for our YouTube Channel and you can see it as reference.

Logic:

Cabbage papers turn pinkish when the liquid is acidic and greenish when the solution is base. So, you can use cabbage papers to determine whether a solution is acidic or base. How does red cabbage indicator change the colour as acidity changes? The answer is simple, you can read about it here

Leave a Reply