Nitrosylsulfuric acid

Nitrosylsulfuric acid
Names
	IUPAC name Nitrosylsulfuric acid
	Other names nitrosonium bisulfate, chamber crystals
Identifiers
CAS Number	7782-78-7 ;
3D model (JSmol)	Interactive image;
ChemSpider	74147 ;
ECHA InfoCard	100.029.058
PubChem CID	82157;
UNII	40K942UPM8 ;
CompTox Dashboard (EPA)	DTXSID30889380 ;
	InChI InChI=1S/HNO5S/c2-1-6-7(3,4)5/h(H,3,4,5) Key: VQTGUFBGYOIUFS-UHFFFAOYSA-N ; InChI=1/HNO5S/c2-1-6-7(3,4)5/h(H,3,4,5) Key: VQTGUFBGYOIUFS-UHFFFAOYAM;
	SMILES O=NOS(=O)(=O)O;
Properties
Chemical formula	HSO4NO
Molar mass	127.08 g/mol
Appearance	Pale yellow crystals
Density	1.865 g/mL in; 40% sulfuric acid soln
Melting point	70 °C (158 °F; 343 K)
Boiling point	Decomposes
Solubility in water	Decomposes
Solubility	Soluble in H2SO4
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Oxidizer
Related compounds
Other anions	NOCl
Other cations	NaHSO4
Related compounds	NOBF4
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Nitrosylsulfuric acid is the chemical compound with the formula HSO₄NO. It is a colourless solid that is used industrially in the production of caprolactam, and was formerly part of the lead chamber process for producing sulfuric acid. The compound is the mixed anhydride of sulfuric acid and nitrous acid.

In organic chemistry, it is used as a reagent for nitrosating, as a diazotizing agent, and as an oxidizing agent.