Vinegar & Bicarbonate Soda Bubbles

You will need the following for this experiment:

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Please make sure to read the instructions before you start so that you have everything you need . . . . good luck and have fun!


  • 1 tbsp of bicarbonate of soda
  • 1 tbsp of washing powder
  • approx 180 ml of water
  • about 60 ml of vinegar
  • 3-5 drops of food colouring (optional)

Additionally you will need a drinking glass that holds 400ml, a tray and a teaspoon to do this experiment.

Place the drinking glass on the tray. Put the bicarbonate of soda and the washing powder into the glass. Add the water and a few drops of food colouring (optional). Gently stir the mixture in the glass. Now, to see the fantastic foaming and fizzing bubbles quickly add the vinegar to the glass as well. The mixture will now foam up and over the top of the glass and will cover the tray with a froth of tiny bubbles.

To produce a colour change when the vinegar is added to the mixture, you can use red cabbage juice or grape juice in place of the optional food colouring. With red cabbage juice, the mixture will change colour from blue-green before adding vinegar to red-orange after the vinegar is added. Try grape juice and see what happens.

Vinegar & Bicarbonate Soda Bubbles

Another alternative method is here. We strongly suggest this experiment is carried out, outdoors!


  • An empty 1.5 or 2 litre bottle per person
  • Water
  • Washing up liquid, a drop or 3
  • Food colouring, a couple of drops
  • Bicarbonate of soda, 2-3 tbsp
  • Vinegar, approx 100-150ml

First make sure you have a bottle per person. Fill each one about ¾ full with warm water and add a squirt of washing up liquid.

You will need lots of vinegar, a couple of tablespoons of bicarbonate of soda and some drops of food colouring per bottle. Be aware that food colourings will most likely cause staining of surfaces and clothes. Food colouring can easily be left out – this is only to add coloured bubbles.

Now add a couple of tbsp of bicarbonate to each bottle. Put your hand over the top of the bottle and give a good shake to mix in and to get the bubbles from the washing up liquid going. If adding food colouring, this goes in now. By adding it now just before the vinegar goes in, it means you get lovely bright coloured bubbles.

Finally add some vinegar – 100ml should do the trick. Give bottle a little squeeze to help things along. You can ‘recharge’ the mixture by adding more bicarbonate and more vinegar.

NEVER SEAL bottle with lids or caps as this creates a baking soda bomb which is dangerous.

Download Vinegar & Bicarbonate Soda Bubbles craft idea in pdf format (29kb)

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