The Erupting Pumpkin Science Experiment


Maxx and I love carving pumpkins to create scary scenes however we recently bought a pumpkin for another purpose – for a fun science experiment. Maxx started school in September and loves learning new things so when I came across a Halloween themed pumpkin experiment I knew he would love it.

You will need:

  • a pumpkin (carved)
  •  baking soda
  • vinegar
  • food colouring (optional)

To start hollow out your pumpkin and carve a scary face into it. Put 4 heaped tablespoons of baking soda into the pumpkin (we put it in a bowl) quickly tip in 400ml of vinegar either directly on top of the baking soda or into the bowl depending on which method you used. If you want to add some colour mix some food colouring into the vinegar before adding it to the baking soda.

Now watch what happens! The vinegar and baking soda will react making foam erupt from the pumpkin. It is possible for the foam to come out of the nose and eyes too but this would require a larger quantity of vinegar and baking soda.

When doing this experiment it is best to do it outdoors or on a messy mat as the mixture might stain hands, clothes or surfaces due to the colouring.

Have fun with this experiment, try adding different colourings, using different sized pumpkins and carving different faces to see how the results differ. The great thing is you can use the pumpkin over and over again.

Have fun!

Halloween Feature 2013

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