How to make pH indicator test strips

Making pH indicator test strips is surprisingly easy and I was very impressed with how well they worked.

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What you need

Red Cabbage Indicator – made by boiling chopped red cabbage in water for 10 minutes

White filter paper

Vinegar/baking soda/lemon juice to test

Instructions

Dip a piece of filter paper into the red cabbage indicator and leave to dry.

Once dry, drop the solutions to test onto the paper and watch as the colour changes

make ph indicator paper

 

Indicators and the pH scale

Solutions can be acidic, alkaline or neutral:

  • an acidic solution is when an acid is dissolved in water
  • an alkaline solution is when an alkali is dissolved in water
  • solutions that are neither acidic nor alkaline are neutral.

Pure water is neutral.

An indicator is a substance that changes colour when added to an acidic or alkaline solution.

In a laboratory either Litmus or Universal Indicators are used. Litmus can only tell us if a substance is an acid or alkali while Universal Indicator tells us how strong the acid or alkali is.

 

Make your own pH Indicator Paper

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