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Le Chatelier's principle: the equilibrium between nitrogen dioxide and dinitrogen tetroxide

Description

The effect of pressure and temperature on the equilibrium between nitrogen dioxide and dinitrogen tetroxide is demonstrated in this experiment.

Credits

:
This is an experiment from the Practical Chemistry project, developed by the Nuffield Foundation and the Royal Society of Chemistry.
le-chateliers-principle-t...



Apparatus Chemicals

Eye protection for the demonstrator and access to a fume cupboard.

Clear glass gas syringes (100 cm3), 2 or 3 (the experiment can be done with one)

Rubber septum caps to fit syringe tips, 2 or 3 (Note 3)

Plastic tubing, short lengths (Optional) (Note 4)

Screw clips (Hoffmann) for rubber tubing, 2 or 3 (Optional) (Note 4)

Boiling tube with a side arm

Hard glass (borosilicate) boiling tube

One-holed rubber stoppers to fit the boiling tubes, 2

Glass tubing, 2 short lengths – to fit stoppers and bent as shown in the diagram below

Rubber tubing, 3 or 4 short lengths

Spring clip (Mohr) for rubber tubing (Optional)

Three-way stopcock or glass (or plastic) T-piece

Beaker (400 cm3)

Beakers (2 dm3), 2

Thermometer (-10 – 110 °C)

Bunsen burner, tripod and gauze.

Bosses, clamps and stands as needed.

The quantities given are for one demonstration:

Lead(II) nitrate(V) (TOXIC, DANGEROUS FOR THE ENVIRONMENT), 10 - 20 g (Notes 1 and 2)

Crushed ice, about 400 cm3

Common salt (sodium chloride) or crushed rock salt, about 100 g

Light lubricating oil (such as WD-40), a few drops

Refer to Health & Safety and Technical notes section below for additional information.

 


 











The effect of pressure and temperature on the equilibrium between nitrogen dioxide and dinitrogen tetroxide is demonstrated in this experiment.

ADDITIONAL INFORMATION

This is a resource from the Practical Chemistry project, developed by the Nuffield Foundation and the Royal Society of Chemistry. This collection of over 200 practical activities demonstrates a wide range of chemical concepts and processes. Each activity contains comprehensive information for teachers and technicians, including full technical notes and step-by-step procedures. Practical Chemistry activities accompany Practical Physics and Practical Biology.