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KS2 Science at Home: Week 11

Key Stage 2 Experiment of the Week! – Fizzy Colours!

How does it work?
Mixing acid (vinegar) and a base/alkali (bicarbonate of soda) causes a reaction to happen which is the bubbles of carbon dioxide produced. This is how the fizzy colours are created.

Fizzy colors fb

Materials you need

  • Shallow Tray
  • Plastic pots of cups
  • White vinegar
  • Paint brushes
  • A few tubs of bicarbonate of soda
  • Food colouring in several colours.


  1. Pour the bicarbonate of soda into the tray and spread it out.
  1. Drop a few blobs of different coloured food colouring into each paint pot.
  1. Top up to half full with white vinegar.
  1. Put a paint brush into each paint pot.
  1. Suck the coloured vinegar onto the paint brush.

     6. Drip the colour into the tray.

     7. Once you have dripped 2 or more colours use the brush             to mix the 2 colours together.


What happens to the powder and the liquid?

What can you see in the mixture?