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| Names | |
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| Preferred IUPAC name
Peroxynitrous acid[citation needed] | |
| Systematic IUPAC name | |
| Identifiers | |
3D model (JSmol) |
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| ChEBI | |
| ChEMBL | |
| ChemSpider |
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| 49207 | |
| MeSH | Peroxynitrous+Acid |
PubChem CID |
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CompTox Dashboard (EPA) |
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| Properties | |
| NHO 3 | |
| Molar mass | 63.0128 g mol−1 |
| Conjugate base | Peroxynitrite |
| 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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Peroxynitrous acid (HNO3) is a reactive nitrogen species (RNS). It is the conjugate acidofperoxynitrite (ONOO−). It has a pKa of approximately 6.8. It is formed in vivo from the diffusion-controlled reaction of nitrogen monoxide (ON•) and superoxide (O•−
2). It is an isomer of nitric acid and isomerises with a rate constantofk = 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 the cis- to the trans-configuration of ONOOH.[3] Peroxynitrous acid is also important in atmospheric chemistry.
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Nitrogen species
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| Hydrides |
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| Organic |
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| Oxides |
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| Halides |
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| Oxidation states | |
