Chemical elements
    Nitrogen Cycle
    Physical Properties
    Chemical Properties
      Nitrogen Chloride
      Nitrogen Iodide
      Nitrosyl Fluoride
      Nitrosyl Chloride
      Nitrosyl Bromide
      Nitryl Fluoride
      Nitryl Chloride
      Hyponitrous acid
      Nitrous Oxide
      Nitric Oxide
      Nitrogen Trioxide
      Nitrogen Tetroxide
      Nitrogen Pentoxide
      Nitroso-nitrogen Trioxide
      Nitrous Acid
      Pernitric Acid
      Sulphur Nitride
      Pentasulphur Dinitride
    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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