pH Indicator 7
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pH Indicator

pH Indicator

pH Indicator is a fun science experiment for kids to do at home which shows that how a  pH  strip can give so many shades of color on being tested with different solutions. Does the colour depend whether it’s an acid or base?

Safety First! Adult Supervision Required. Don’t Eat/Drink your Experiments, Wear safety goggles where ever required


Materials and tools required.

In the box

  • Transparent bowls
  • Neutral Solution

Video on Youtube for the Experiment

What to Do!

  1. Place four transparent bowls and put 50 ml of lemon juice, neutral solution, baking soda solution and bleach in the bowls.
  2. Take out pH strips and place it next to each bowl.
  3. Dip the pH strips in the solutions one-by-one.
  4. Now match the color of the pH strips with the standard pH chart.

Images for Instructions

Working Principle of pH Indicator Experiment :

All liquids can be indicated as acids, bases or neutral. pH is a measure of how acidic or basic a liquid is.

pH stands for “the potential for Hydrogen”. The scale ranges from 1 to 14 where a pH of 7 is neutral – it is neither basic nor acidic. If the pH is less than 7, then it is acidic while a pH greater than 7 is basic. In this experiment, when we dip the pH strips into different solutions having different pH, the color of the strips change according to the pH of the solutions which can be matched with the standard pH chart. For example: when we tested lemon juice with the pH strip it turned pale red, which proves that lemon juice is acidic in nature having pH 2. Similarly, a pH strip dipped in baking powder solution turned green showing that it is basic in nature and its pH is in the range 9-11.


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