The Barking Dog Reaction

This is a reaction between nitrogen monoxide and carbon disulphide. It has this name because the sound given off is said to sound like a dog’s bark.

It should be carried out entirely in a fume cupboard, and the wearing of safety equipment (disposable gloves and goggles) is essential, because carbon monoxide and sulphur dioxide, both toxic gases, are products of this reaction.

The stopper is taken off a sealed tube containing nitrogen monoxide to which is added three drops of carbon disulphide. The stopper is replaced straight away to prevent leakage and to ensure the reaction takes place. The whole thing is swirled around gently to assist the reaction, then put back onto a clamped stand.

A match or a splint is then lit and placed into the tube. A bright flash of almost blue light can be observed coming from the tube accompanied by a loud ‘woof’ sound, which is characteristic of the reaction.

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