Frothy Fizzing Lemons

My youngest and I thought we would make a little video today to show you some really simple science.

Here is a list of things you will need..

  • Lemons
  • Food Colouring
  • Washing Up Liquid
  • Bicarbonate of Soda (Baking Soda)
  • Lollipop Sticks (not essential)
  • A container/tray to stop the mess from going everywhere
Start off by slicing your lemon in half. After you have done this, poke some holes into the segments, (we used our lollipop stick for this, but you can use whatever you have to hand)
We used gel food colouring for ours, but it’s only because we already had it in our science kit. You can use whatever you have available to add some colour.
The next step is to squeeze a few drops of colour onto the segments – poking holes into the lemons at the start will help soak up the colour for a fun reaction. After you have added your colour(s) squeeze a small amount of washing up liquid over the surface of the lemon.

After you have done these steps, you need to sprinkle the bicarbonate of soda and wait for the lemon to start foaming. To make the reaction better, use the other half of your lemon to squeeze more lemon juice over the top.

Keep prodding the lemon with your lollipop stick to release the colour and then continue to add bicarb and more lemon juice until you get a reaction that you are happy with.

(this is why you need a container/tray) 🙂

The Sciency Stuff…

Lemon juice contains citric acid and when mixed with an alkaline (bicarbonate of soda) a chemical reaction happens. When the white powder (bicarb), and lemon juice join together, they make a colourless gas called CARBON DIOXIDE! The fizzing is the chemical reaction and the bubbles produced are CARBON DIOXIDE GAS!!!

(The washing up liquid helps make the reaction more fun but is also optional – we just loved the extra foam)

If your reaction isn’t what you expected, mash your lemon up a little more to produce more lemon juice, or squeeze more on using the other half of your lemon.

Thanks for reading, have fun!!!

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