 | This articleneeds additional citations forverification. Please helpimprove this article byadding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "Peroxynitrous acid" – news ·newspapers ·books ·scholar ·JSTOR(January 2007) (Learn how and when to remove this message) |
 | |
 | |
 | |
| Names | |
|---|---|
| Preferred IUPAC name Peroxynitrous acid[citation needed] | |
| Systematic IUPAC name | |
| Identifiers | |
3D model (JSmol) | |
| ChEBI | |
| ChEMBL | |
| ChemSpider |
|
| 49207 | |
| MeSH | Peroxynitrous+Acid |
| |
| |
| Properties | |
| NHO 3 | |
| Molar mass | 63.0128 g mol−1 |
| Conjugate base | Peroxynitrite |
| Related compounds | |
Related compounds | |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Peroxynitrous acid (HNO3) is areactive nitrogen species (RNS). It is theconjugate acid ofperoxynitrite (ONOO−). It has apKa of approximately 6.8. It is formedin vivo from the diffusion-controlled reaction ofnitrogen monoxide (ON•) andsuperoxide (O•−
2). It is an isomer ofnitric acid and isomerises with arate constant ofk = 1.2 s−1, a process whereby up to 5% of hydroxyl and nitrogen dioxide radicals may be formed. It oxidises and nitrates aromatic compounds in low yield. The mechanism may involve a complex between the aromatic compound and ONOOH, and a transition from thecis- to thetrans-configuration of ONOOH.[3] Peroxynitrous acid is also important inatmospheric chemistry.
