Baking soda ice cubes

Today is the first day of the summer holidays for us, and I have a big plan to post an activity every day for the six weeks.We’re kicking off with a favourite reaction, baking soda and vinegar. The reaction between baking soda and vinegar is a great first chemical reaction for children to learn about and these baking soda ice cubes are brilliant fun.

baking soda reaction


  • Ice cube tray
  • Food colouring ( optional )
  • Bicarbonate of Soda ( Baking Soda )
  • Water
  • Vinegar

baking soda


  • Mix some baking soda with water ( add food colouring too if you want ). I didn’t measure but added a good amount of the baking soda.
  • Freeze for a few hours or overnight.
  • Warning – this bit might get messy, so do outside or use a big tray. Be careful not to get vinegar into little eyes as well.
  • Let the cubes defrost a little, and then add some vinegar
  • Watch the fizzing.

baking soda reaction

The Science Bit

Vinegar (an acid ) and bicarbonate of soda ( an alkali ) react together to neutralise each other. This reaction releases carbon dioxide, a gas which is the bubbles you see.

As the Baking Soda is frozen in the ice it takes a while for the reaction to start in this activity, but it’s worth the wait.


baking soda reaction

Don’t forget to pop back tomorrow to see another fun science activity for kids.

Inspiration Laboratories froze the vinegar instead of the baking soda and also had great results. I really want to freeze both now.

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Baking soda ice experiment

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