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Peroxynitric acid
Names
	Preferred IUPAC name Hydroxy nitrate
	Systematic IUPAC name Hydroxy nitrate
Identifiers
CAS Number	26404-66-0 ;
3D model (JSmol)	Interactive image;
ChemSpider	58833 ;
PubChem CID	65357;
CompTox Dashboard (EPA)	DTXSID201030501 ;
	InChI Key: UUZZMWZGAZGXSF-UHFFFAOYSA-N [Pubchem];
	SMILES [N+](=O)([O-])OO;
Properties
Chemical formula	HNO4
Molar mass	79.01224 g/mol
Conjugate base	Peroxynitrate
Related compounds
Related compounds	Peroxynitrous acid; Peroxynitrate;
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Peroxynitric acid or peroxonitric acid is a chemical compound with the formula HNO
₄. It is an oxyacid of nitrogen, after peroxynitrous acid.

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]

HO
₂NO
₂ ⇌ HO^•
₂ + NO^•
₂

References

^ "Peroxynitric Acid - Compound Summary".
^ "peroxynitric acid". PubChem. Retrieved 9 December 2012.
^ "125239-87-4". ChemIndex. Retrieved 9 December 2012.
^ Miyamoto, S; Ronsein, GE; Corrêa, TC; Martinez, GR; Medeiros, MH; Di Mascio, P (2009). "Direct evidence of singlet molecular oxygen generation from peroxynitrate, a decomposition product of peroxynitrite". Dalton Trans (29): 5720–9. doi:10.1039/b905560f. PMID 20449086.
^ Finlayson-Pitts, Barbara J.; Pitts, James N. (2000), Chemistry of the Upper and Lower Atmosphere, Elsevier, p. 100, doi:10.1016/b978-012257060-5/50000-9, ISBN 978-0-12-257060-5, retrieved 2020-09-24

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[1] "Peroxynitric Acid - Compound Summary".

[Peroxynitric_Acid-2] "peroxynitric acid". PubChem. Retrieved 9 December 2012.

[CAS_No._125239-87-4-3] "125239-87-4". ChemIndex. Retrieved 9 December 2012.

[Direct_evidence_of_singlet_molecular_oxygen_generation_from_peroxynitrate,_a_decomposition_product_of_peroxynitrite.-4] Miyamoto, S; Ronsein, GE; Corrêa, TC; Martinez, GR; Medeiros, MH; Di Mascio, P (2009). "Direct evidence of singlet molecular oxygen generation from peroxynitrate, a decomposition product of peroxynitrite". Dalton Trans (29): 5720–9. doi:10.1039/b905560f. PMID 20449086.

[5] Finlayson-Pitts, Barbara J.; Pitts, James N. (2000), Chemistry of the Upper and Lower Atmosphere, Elsevier, p. 100, doi:10.1016/b978-012257060-5/50000-9, ISBN 978-0-12-257060-5, retrieved 2020-09-24

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