IUPAC Name: Nitroso hydrogen sulfate
Canonical SMILES: N(=O)OS(=O)(=O)O
InChI: InChI=1S/HNO5S/c2-1-6-7(3,4)5/h(H,3,4,5)
InChIKey: VQTGUFBGYOIUFS-UHFFFAOYSA-N
Molecular Weight: 127.07664 [g/mol]
Molecular Formula: HNO₅S
XLogP3-AA: -0.9
H-Bond Donor: 1
H-Bond Acceptor: 6 
EINECS: 231-964-2 
storage temp.: Refrigerator (+4 °C)
Water Solubility: decomposes
Appearance: Yellowish viscous liquid
Melting Point: -10 °C 
Index of Refraction: 1.546
Molar Refractivity: 18.43 cm³
Molar Volume: 58.1 cm³
Surface Tension: 104 dyne/cm
Density: 2.18 g/cm³
Product Categories of Nitrososulfuric acid (CAS NO.7782-78-7): Inorganics; pharmacetical; Chemical Synthesis; Inorganic Acids; Synthetic Reagents

 Nitrosylsulfuric acid (CAS NO.7782-78-7) is used for diazotisation, nitrosation, oxidation and oximation reactions. Product Data Sheet .

Reactivity Profile of Nitrososulfuric acid (CAS NO.7782-78-7): Nitrosylsulfuric acid is an oxidizing agent. Neutralizes chemical bases in exothermic reactions. An attempt to diazotize dinitroaniline using Nitrosylsulfuric acid resulted in an explosion with loss of life. The event was blamed on the high concentration of the reactants dinitroaniline hydrochloride and Nitrosylsulfuric acid .

Reported in EPA TSCA Inventory.

A poison. A corrosive irritant to skin, eyes, and mucous membranes. Explosive reaction above 50°C with 2-chloro-4,6-dinitroaniline and 4-chloro-2,6-dinitroaniline. Potentially explosive reaction with dinitroaniline. When heated to decomposition it emits toxic fumes of SO_x and NO_x.
Safety Information  of Nitrososulfuric acid (CAS NO.7782-78-7):
Hazard Codes: O,T
Risk Statements: 8-14-23/24/25-35-34
8: Contact with combustible material may cause fire 
14: Reacts violently with water 
23/24/25: Toxic by inhalation, in contact with skin and if swallowed 
35: Causes severe burns 
34: Causes burns  
Safety Statements: 17-26-36/37/39-45-27
17: Keep away from combustible material 
26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice
36/37/39:  Wear suitable protective clothing, gloves and eye/face protection 
45: In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) 
27: Take off immediately all contaminated clothing 
RIDADR: UN 3264 8/PG 2
WGK Germany: 3
HazardClass: 8
PackingGroup: II

 Nitrososulfuric acid (CAS NO.7782-78-7), its Synonyms are Nitrosylsulphuric acid ; Sulfuric acid, anhydride with nitrous acid (1:1) ; Sulfuric acid, monoanhydride with nitrous acid .