Laboratory Notes: Generation and collection of nitrogen dioxide (NO2) gas for equilibrium demonstrations
Nitrogen dioxide gas is used to demonstrate Le Chatelier’s principle of equilibrium. The gaseous equilibrium is a mixture of nitrogen dioxide, a brown to reddish brown gas, and dinitrogen tetroxide, a colourless gas.
The preparation and handling of nitrogen dioxide should only be conducted in an operating fume cupboard by trained staff, wearing appropriate PPE.
These laboratory notes provide a method for the generation and collection of nitrogen dioxide (NO2) gas for two equilibrium demonstrations: the effect of temperature and the effect of pressure.