Fun Science: Experiments that fizz and bubble!

Did you know that there are lots of activities that you can do with your kids that involve making experiments that fizz. We have complied together 3 of our favourite fizzing experiments that you can try at home.

1. Rainbow Eruptions

fizzing science experiment

You will need:

  • Water
  • Bicarbonate of soda
  • Squeezy bottles (e.g. ketchup bottles)
  • Food colouring x 5
  • Powdered drink flavouring x 5 or effervescent vitamin tablets
  • Small containers x 5 e.g. tupperware


  • Put one packet of powdered flavouring mixture or a vitamin tablet into each of the small containers and cover with a heaped tsp of bicarbonate of soda.
  • Add a different colour of food colouring to each pot
  • Fill the bottles with water and squirt water into each pot to make the fizzing start!



The Science bit:

Powdered drink flavouring and vitamin tablets both contain citric acid. When this mixes with bicarbonate of soda it creates carbon dioxide gas. The water just helps the chemicals to mix. Check out our vinegar volcano experiment for a similar reaction.

2. Ice VolcanoesThe next step...

You will need:

  • Bicabonate of soda
  • Water
  • Vinegar
  • Food colouring
  • Small bowls
  • Golf balls
  • Cling film
  • A freezer

MethodThe volcanoes are ready!

  • Place a golf ball in each ot the bowls and then cover the whole bowl with cling film so that it covers the ball and goes over the sides of the bowl.
  • Fill the bowls with a mixture that is 50% water and 50% bicarbonate of soda with a few drops of food colouring. Make sure the mixture covers the ball.
  • Place the bowls in the freezer overnight.
  • Once frozen, let the bowls thaw a little and then remove the ice from the bowl and remove the ball (try using a butter knife if it won’t come out).
  • Turn the ice so that it is ‘hole side up’ and looks like a volcano. Pour vinegar into the hole and wait for the eruption.


3. Fizzy colour mixingscience-experiments

This experiment is really fun for kids to try and will also help to teach them about primary and secondary colours.

You will need:

  • Clear cups
  • Bowls
  • Bicarbonate of soda
  • Vinegar
  • Food colouring
  • Pipette


  • Place an equal amount of bicarbonate of soda into 3 different bowls.
  • Add vinegar to the clear cups, about half way up in each.
  • Next you need to colour the baking soda and vinegar. Simply add a few drops of food colouring to the bowls of bicarbonate of soda and cups of vinegar.
  • Start to mix the different colours together and see how many different colours you can make. Use a pipette to squirt vinegar into the coloured bicarbonate of soda.