Chemical elements
  Nitrogen
    Isotopes
    Energy
    Nitrogen Cycle
    Production
    Application
    Physical Properties
    Chemical Properties
      Nitrogen Chloride
      Nitrogen Iodide
      Monochloramine
      Nitrosyl Fluoride
      Nitrosyl Chloride
      Nitrosyl Bromide
      Nitryl Fluoride
      Nitryl Chloride
      Di-imide
      Nitramide
      Nitrohydroxylamine
      Hyponitrous acid
      Nitrous Oxide
      Nitric Oxide
      Nitrogen Trioxide
      Nitrogen Tetroxide
      Nitrogen Pentoxide
      Nitroso-nitrogen Trioxide
      Nitrous Acid
      Pernitric Acid
      Sulphur Nitride
      Pentasulphur Dinitride
    Ammonia
    Hydroxylamine
    Hydrazine
    Azoimide
    Nitric Acid

Pernitric Acid, HNO4






The supposed nitrogen hexoxide was considered to give a Pernitric Acid, HNO4, with water. Oxidation of nitrous acid in solution by 3 per cent, hydrogen peroxide solution is stated by Raschig to produce pernitric acid:

HNO2 + 2H2O2 = HNO4 + 2H2O.

The decomposition of pernitric acid by water occurs slowly, according to the reaction

HNO4 + H2O = HNO3 + H2O2.

Pure hydrogen peroxide and nitrogen pentoxide at low temperatures yield a substance exhibiting typical properties of a per-acid:

H2O2 + N2O5 = HNO4 + HNO3.

Bromine is liberated from potassium bromide, and aniline is oxidised to nitroso-benzene by the acid.

Electrolysis of a solution of silver nitrate yields a black crystalline precipitate, assumed to be the silver salt of pernitric acid.
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