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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.