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Fizzy bombs

You will need:

  • A container
  • Spoon
  • 1/2 cup bicarb soda
  • Food colouring
  • Water (optional)
  • Muffin tray or ice cube tray


  1. Pour bicarb soda into container, carefully mix in a few drops of food colouring at a time with a spoon until you get the desired colour. The mixture should be crumbly, and holds its shape when pressed with the spoon. If not, add a few drops of water and mix, repeat until it does.

    Cup with orange crumbly mixture with a spoon sticking out, next to it a bottle of red food colouring all on a white and blue checkered background
  2. Fill the muffin tray or ice cube tray with the mixture, about 2/3 of the way up. Pack down with the back of the spoon.

    Orange mixture pressed into 4 compartments of an ice cube tray on blue and white checkered background
  3. Leave to dry for an hour then turn out onto a plate.
  4. Drip vinegar on top of the fizzy bomb or chuck one into a cup of vinegar!

4 small orange mounds on a white plate sitting on a blue and white checkered background, one mound covered and white foam and one mount has white foam half way up
Bicarb soda and vinegar fizzy bombs!

Be Amazing Book Front Cover; Ben Newsome, teacher & founder of Fizzics Education. Be Amazing -how to teach science the way primary kids love
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What is the chemical reaction occurring here?

  • Vinegar + Bicarbonate Soda ---> Carbonic Acid + Sodium Acetate

    The carbonic acid is unstable though, so it breaks down into water and carbon dioxide forming the bubbles you see when the bicarb soda comes in contact with vinegar.

For more bicarb soda and vinegar experiments, check out this list in our blog!

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