- Barking dog reaction
The "Barking Dog" is an
exothermic chemical reactionthat results from the ignition of a mixture of carbon disulfideand nitric oxide.
It has been known for centuries; in
1853, Justus von Liebigwas using the bright blue flash and the distinctive ‘woof’ sound of the demonstration to enthrall his students.
In simple terms, the ‘Barking Dog’ reaction is a
combustionprocess, in which a fuel ( carbon disulfide, CS2) reacts with an oxidiser ( nitric oxide(NO) or nitrous oxide(N2O)), producing heat. The flame front in the reaction is a zone of very hot, luminous gas, produced by the reactants decomposing.
This reaction is similar to the well-known hydrogen-oxygen reaction, but is accompanied by a characteristic “barking” sound. A mixture of nitric oxide and the vapour of carbon disulfide, contained in a long tube, is ignited. The combustion wave travels at a moderate rate down the tube compressing the gas ahead of it. At a certain distance, dependent on the diameter of the tube, the residual mixture explodes. In a very long tube the passage of the explosion wave may be seen. This reaction also produces a considerable amount of very bright blue light and is one of the few examples of chemical
luminescencein the gas phase.
* [http://www.chem.leeds.ac.uk/delights/texts/expt_22.html University of Leeds Barking Dog site]
* [http://www.fireintheholevideos.tk Page linking to a recorded lecture on the reaction]
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