Hypergolic Reaction of NO2 and Aniline

When liquid is added to brown gas it catches fire.

Scientific name: Aniline reacts with nitrogen dioxide with evolution of heat.


Hypergolic Reaction - Periodic Videos

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Hypergolic Reaction (reaction only)

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This experiment must be performed only in a fume hood. Wear eye protection goggles and gloves.

Always follow general safety recommendations. Please note that conducting chemistry experiments you must comply with the relevant legal procedures in your country.

Reaction formula

8C6H5NH2 + 62NO2 → 48CO2 + 28H2O +35N2

Step-by-step instruction

WARNING! This experiment is dangerous! You should NOT perform this at home. ONLY carry out this experiment, if you are a trained chemist, and you understand local safety and legal requirements, which are required to perform such experiments

  1. Since nitrogen dioxide is a hazardous gas, this experiment must be performed only in a fume hood.
  2. Prepare the test tube. Put the stand into the fume hood.
  3. Cool down the test tube.
  4. Put the test tube on the stand.
  5. Fill the test tube with nitrogen dioxide.
  6. Add a few drops of aniline to the test tube. Use a long pipette.
  7. Aniline reacts spontaneously and generates lots of smoke and fire.

Scientific background

Aniline reacts with nitrogen dioxide readily. This is a highly exothermic process. The mixture easily catches fire when the reaction passes:

8C6H5NH2 + 62NO2 → 48CO2 + 28H2O +35N2

Theoretically all products of the reaction are gaseous. But in fact the combustion process is not fully complete and some carbon is produced as an intermediate product.


Published on 25 February 2015

  • Fire
  • Heating with fire
  • Explosion
  • Poisoned gas
  • Organic
  • Electricity
  • Solution
  • Oxidation reduction
  • Color change
  • Precipitate
  • Gassing
  • Catalyst