Peroxynitric acid
Chemical compound
From Wikipedia, the free encyclopedia
Peroxynitric acid or peroxonitric acid is a chemical compound with the formula HNO4. It is an oxyacid of nitrogen, after peroxynitrous acid.
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| Names | |||
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| Preferred IUPAC name
Hydroxy nitrate | |||
| Systematic IUPAC name | |||
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3D model (JSmol) |
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PubChem CID |
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CompTox Dashboard (EPA) |
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| Properties | |||
| HNO4 | |||
| Molar mass | 79.011 g·mol−1 | ||
| Conjugate base | Peroxynitrate | ||
| Related compounds | |||
Related compounds |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Preparation
Peroxynitrate, the conjugate base of peroxynitric acid, is formed rapidly during decomposition of peroxynitrite in neutral conditions.[4]
Atmospheric chemistry
Peroxynitric acid is formed in the atmosphere, although it is unstable, it is important as a reservoir for NO2 through the reversible radical reaction:[5]
- HO2NO2 ⇌ HO2• + NO2•
Stability
The pure compound decomposes explosively at −30 °C (−22 °F). Solutions in water or acetic acid of over 70% concentration decompose autocatalytically with resulting explosions.[6]
