Difference between revisions of "Barking dog reaction"

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The barking dog reaction is an exothermic chemical reaction that results from the ignition of a mixture of carbon disulfide and nitrous oxide in a cylindrical tube, like a graduated cylinder.^[1] When ignited, the reaction produces a bright flash and a loud "woof"-like sound, reminiscent of a barking dog.

Mechanism

In simple terms, the "barking dog" reaction is a combustion process, in which a fuel (carbon disulfide, CS₂) reacts with an oxidizing agent (nitrous oxide, N₂O), producing heat and elemental sulfur. The flame front in the reaction is a zone of very hot, luminous gas, produced by the reactants decomposing:

8 N₂O + 4 CS₂ → S₈ + 4 CO₂ + 8 N₂

The length of the tube causes the sound of the reaction.

Video demonstrations

• Barking Dog (slow motion) - Periodic Table of Videos, University of Nottingham
• ScienceBob
• Thoisoi2 - Chemical Experiments!
• NileRed Shorts
• Elementary Productions: Small scale Barking Dog reaction @ youtube
• EXPLOSIVE Barking Dog Reaction! Cryogenic Gases Explosion! (ChemicalForce)
• featured in Making laughing gas (NileRed)

References

1. ↑ http://jchemed.chem.wisc.edu/Journal/Issues/2006/May/abs751.html%7Cdoi=10.1021/ed083p751

Relevant Sciencemadness threads

• Barking Dog Reaction
• Sulfur Dioxide and the Barking Dog