| Peroxynitrous acid | |
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Peroxynitrous acid |
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Hydroxy nitrite[1] |
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| Identifiers | |
| CAS number | 14691-52-2 |
| PubChem | 123349 |
| ChemSpider | 109951 |
| MeSH | Peroxynitrous+acid |
| ChEBI | CHEBI:25942 |
| Gmelin Reference | 49207 |
| Jmol-3D images | Image 1 |
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| Properties | |
| Molecular formula | HNO3 |
| Molar mass | 63.01 g mol−1 |
| Exact mass | 62.995642903 g mol-1 |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) | |
| Infobox references | |
Peroxynitrous acid (HNO3) is a Reactive nitrogen species(RNS), commonly known as a free radical. It is the conjugate acid of peroxynitrite (ONOO−). It has a pKa of ~6.8. Peroxynitrous acid can homolyze to form nitrogen dioxide and hydroxyl radical as a pair of caged radicals. Approximately 66% of the time, these two radicals undergo electron transfer to form nitronium ion and hydroxide. The other 33% of the time, the two species escape the solvent cage as free radicals.
Peroxynitrous acid is thought to be important in atmospheric chemistry.