Red Cabbage Indicator Colour Changing Potions

These red cabbage indicator colour changing potions are fantastic fun for kids of all ages and very easy to create. We used red cabbage indicator and added different amounts of baking soda ( an alkali ) and vinegar ( an acid ) to make the different colours.

What is a pH Indicator?

 is a substance which has one colour when added to an  and a different colour when added to an .

Acids have a low pH and bases a high pH.

Why does red cabbage make a good indicator?

Red cabbage contains a chemical called anthocyanin. This changes colour depending on the acidity of its environment. It turns a pink/red colour in the presence of an acid, is purple when neutral and when added to an alkaline substance turns blue or green.

What you’ll need

Red Cabbage ( chopped )

A pan

Water

A stove

Strainer

Selection of jugs, jars and beakers

Vinegar

Dish soap ( washing up liquid )


colour changing potions

Instructions

Place your chopped red cabbage into a pan, cover with water and heat until the water turns purple ( ask an adult to help )

Carefully pour the mixture through a strainer to remove the red cabbage and collect the solution in a container.

Pour the indicator into smaller beakers, it doesn’t really matter how much you use, but we made ours about half full.

Add different amounts of baking soda or vinegar to each one.

How many different colours can you make?

Red cabbage indicator challenge

Make it Fizz!

For a little extra fun, you can add vineger to a beaker containing baking soda and vice versa to see a fizzy colour changing reaction.

red cabbage indicator

colour changing potions

 

Safety note

Wear safety goggles if using strong acids/bases.

An adult should help with the chopping and heating of the cabbage.

red cabbage indicator colour changing potions

More Red Cabbage Indicator Ideas

We love how The Science Kiddo froze some red cabbage indicator to test different substances

Make your own pH indicator test strips

 

red cabbage indicator colour changing potions

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