Tannin in tea

Tannin in tea

Who would have thought a cup of tea could take the iron out of a tablet like this?

Ingredients and equipment that you will need

Cold tea without milk
An iron tablet
Vitamin C tablet or powder or orange juice

Method and further information

Dissolve an iron tablet in a glass of water. Add it to a glass of cold tea.

The tannin in the tea will bind to the iron taking it out of solution. You will see it go black.

If you add vitamin C tablet to the tea first this does not happen.

Be careful – you should ask an adult to help you with these experiments. Do your experiments in old yoghurt pots, jam jars or bottle tops. Don’t use cups or glasses in case someone thinks it’s a drink.