The effect of pressure and temperature on equilibrium | Le Chatelier’s principle

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A photograph of two sealed ampoules containing nitrogen dioxide; one is dark brown in colour, in a beaker of hot water, and one is light brown, in a beaker of ice water.

Source: © Science Photo Library

Try this demonstration to explore the effects of pressure and temperature on an equilibrium mixture with your students. Includes kit list and safety instructions.

In this demonstration, students observe changes in the colour and volume of an equilibrium mixture of brown nitrogen dioxide and colourless dinitrogen tetroxide as it is compressed, heated or cooled. 

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