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Sphere Science presents: Pop Tubs

The reaction between a carbonate and an acid generates carbon dioxide. If this reaction is carried out in a closed container, the force of the gas escaping will blow the lid off. This makes it an exciting way to investigate this particular chemical reaction.

Vitamin C tablets contain these two substances but, until mixed with water, they are not able to react with each other.

Everyone will be shown how to do this simply and safely. They then have to work out how they are going to carry out the experiment themselves. Once they are ready, they do it three times using water at one temperature, recording their results each time.

The experiment is then repeated twice. Each repeat uses water at a different temperature. Everyone ends up with a set of results showing how quickly this reaction has taken place at different temperatures.

The final sets of results give a pattern to show how temperature affects the speed of a reaction.