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KS2 Science at Home: Week 1

An experiment to try....

How to make a volcano –

[Parents: this could be messy!]

This experiment is a chemical reaction between vinegar and baking soda and creates a gas called carbon dioxide. COCarbon dioxide is the same type of gas used to make the bubbles in fizzy drinks (carbonated sodas). What happens if you shake up a a fizzy drink bottle? The gas in the liquid warms up, gets very excited and tries to spread out and escape from the liquid drink. There is not enough room in the bottle for the gas to spread out so the pressure builds up until you open the bottle..... then it leaves through the opening very quickly, causing was is like an eruption!

  • Materials you need
  • 10 ml of washing up liquid
  • 100 ml of cold water
  • 400 ml of white vinegar
  • Food colouring
  • Baking soda slurry (fill a cup about ½ with baking soda, then fill the rest of the way with water). Baking soda is sometimes called sodium bicarbonate and is used for baking cakes.
  • An empty 2 litre plastic bottle [NOT Glass as that would be dangerous].

1.Combine the vinegar, water, washing up liquid and 2 drops of food colouring into the empty plastic bottle.

2.Use a spoon to mix the baking soda slurry until it is all a liquid.

3.Eruption time! … Pour the baking soda slurry into the soda bottle quickly and step back!

Questions to think about

1. Does the amount of vinegar change the eruption?
2. Does the amount of water change the eruption?
3. Does the amount of baking soda change the eruption?


1. Make sure you wash your hands after the experiment and dont rub the chemicals into your eyes.

Stand clear when the volcanoe errupts. do this outdoors or in the bath/shower room to make sure that it doesnt splash your lovely house furniture and carpets!

2. Tidy up afterwards!

Make it into a model Volcano?

 Click here for some great ideas on how to construct your own volcano.