ChemicalBook > CAS DataBase List > Nitrosylsulfuric acid

Nitrosylsulfuric acid

Product Name: Nitrosylsulfuric acid
CAS No.: 7782-78-7
Chemical Name: Nitrosylsulfuric acid
Synonyms: NITROSYL SULFATE;NITROSYLSULPHURIC ACID;nitrosylsulphuric;Nitrosylschwefelsure;NITROSYSULFURIC ACID;Nitrososulfuric acid;NITROSYLSULFURIC ACID;Nitrosyl hydrogensulfate;Nitrosylsulfuric acid 40%;Sulfuric nitrous anhydride
CBNumber: CB3695582
Molecular Formula: HNO5S
Formula Weight: 127.07
MOL File: 7782-78-7.mol

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Nitrosylsulfuric acid Property

Melting point:: -10 °C
Boiling point:: 333℃ at 101.33kPa
Density: 1.612 g/mL at 25 °C
vapor pressure: 2.6-30Pa at 20-50℃
storage temp.: Refrigerator (+4°C)
solubility: reacts with H2O; soluble in H2SO4
pka: -7.51±0.18(Predicted)
form: Viscous Liquid
color: Clear to milky yellow to greenish
Water Solubility: decomposes
Merck: 13,6682
InChI: InChI=1S/HNO5S/c2-1-6-7(3,4)5/h(H,3,4,5)
InChIKey: VQTGUFBGYOIUFS-UHFFFAOYSA-N
SMILES: O(N=O)S(O)(=O)=O
CAS DataBase Reference: 7782-78-7(CAS DataBase Reference)
EPA Substance Registry System: Sulfuric acid, monoanhydride with nitrous acid (7782-78-7)

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Safety

Hazard Codes: O,T
Risk Statements: 8-14-23/24/25-35-34
Safety Statements: 17-26-36/37/39-45-27
RIDADR: UN 3264 8/PG 2
WGK Germany: 3
HazardClass: 8
PackingGroup: II
HS Code: 28111980

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Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Danger

Hazard statements

H272May intensify fire; oxidizer

H290May be corrosive to metals

H314Causes severe skin burns and eye damage

H332Harmful if inhaled

Precautionary statements

P210Keep away from heat/sparks/open flames/hot surfaces. — No smoking.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P303+P361+P353IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.

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N-Bromosuccinimide Price

Sigma-Aldrich

Product number: 517070
Product name: Nitrosylsulfuric acid solution
Purity: 40?wt. % in sulfuric acid
Packaging: 250ml
Price: $54.7
Updated: 2025/07/31

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Nitrosylsulfuric acid Chemical Properties,Usage,Production

Chemical Properties

Nitrosylsulfuric acid, HNO₅S, is a straw-colored, oily liquid furnished as a 40% solution in 87% sulfuric acid,and stable at room temperature. It is used as a diazotizing agent for dyes,chemical intermediate, drugs and pharmaceuticals.

Physical properties

Nitrosylsulfuric acid is produced as an intermediate in the manufacture of sulfuric acid using the lead chamber process by the reaction of sulfur dioxide, nitrogen dioxide, oxygen, and water.
Nitrosylsulfuric acid also is made from absorption of nitrogen oxides (NO_x) in oleum (fuming sulfuric acid):
N₂O₃ + 2H₂SO₄ → 2ONSO₄ + H₂O
or by the reaction of nitrosyl chloride with concentrated sulfuric acid:
ClNO + H₂SO₄ → ONSO₄ + HCl
Another method of preparation involves the reaction of nitrosyl bromide with silver bisulfate:
AgHSO₄ + BrNO → ONHSO₄ + AgBr
In making disperse azo dyes, nitrosylsulfuric acid is produced by the addition of sodium nitrite, NaNO₂, to concentrated sulfuric acid (1g NaNO₂ per 13 g H₂SO₄).

Uses

Nitrosylsulfuric acid (40?wt. % in sulfuric acid) is a reagent used for the preparation of new heterocyclic disperse azo dyes.

Uses

Nitrosylsulfuric acid is used for diazotisation, nitrosation, oxidation and oximation reactions. Product Data Sheet

Uses

For bleaching cereal milling products.

General Description

Shipped in solution with sulfuric acid (solutions are usually 40% Nitrosylsulfuric acid and 54% sulfuric acid (Hawley)). Solution is a straw-colored oily liquid with a sharp odor. When pure, a crystalline solid decomposing at 73°C. Very irritating to skin and eyes. Used to make dyes and other chemicals.

Reactivity Profile

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 [MCA Case History 1763. 1971].

Hazard

Strong irritant to skin and mucous membranes.

Health Hazard

TOXIC; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance may cause severe injury, burns or death. Reaction with water or moist air will release toxic, corrosive or flammable gases. Reaction with water may generate much heat that will increase the concentration of fumes in the air. Fire will produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution.

Fire Hazard

Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. Vapors may accumulate in confined areas (basement, tanks, hopper/tank cars etc.). Substance will react with water (some violently), releasing corrosive and/or toxic gases and runoff. Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated or if contaminated with water.

Safety Profile

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-d1nitroalne. Potentially explosive reaction with dmitroaniline. When heated to decomposition it emits toxic fumes of SOx and NOx. See also SULFATES and NITRATES.

Nitrosylsulfuric acid Preparation Products And Raw materials

Raw materials

Preparation Products

Disperse Red 73 3-[ethyl[4-[(6-nitrobenzothiazol-2-yl)azo]phenyl]amino]propiononitrile Basic Blue 53 Disperse Orange 97 1,4-Dinitronaphthalene Caprolactam

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View Lastest Price from Nitrosylsulfuric acid manufacturers

Chongqing Soarwin Technology Co., Ltd

Product: Nitrosylsulfuric acid 7782-78-7
Price: US $0.00-0.00/kg
Min. Order: 1kg
Purity: 99.99%
Supply Ability: 20 tons
Release date: 2025-04-16

Zhuozhou Wenxi import and Export Co., Ltd

Product: Nitrosylsulfuric acid 7782-78-7
Price: US $15.00-10.00/KG
Min. Order: 1KG
Purity: 99%+ HPLC
Supply Ability: Monthly supply of 1 ton
Release date: 2021-07-11

Zhuozhou Wenxi import and Export Co., Ltd

Product: Nitrosylsulfuric acid 7782-78-7
Price: US $15.00-10.00/KG
Min. Order: 1KG
Purity: 99%+ HPLC
Supply Ability: Monthly supply of 1 ton
Release date: 2021-07-09

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Sulfuricacid,monoanhydridewithnitrousacid

NITROSYLSULFURIC ACID CRYSTALLIZED

NITROSYLSULFURIC ACID, 40 WT. % SOLUTION IN SULFURIC ACID

NITROSYSULFURIC ACID

Nitrosylsulfuric acid, 40% in sulfuric acid

nitrosylsulfuric acid solution

NITROSYLSULFURIC ACID (40% SOLUTION)

Nitrosylsulfuric acid 40%

Nitrosyl hydrogensulfate

Sulfuric acid hydrogen (nitrogen oxide) salt

Nitrosylschwefelsure

Sulfuric acid, anhydride with nitrous acid (1:1)

nitrosylsulfuric acid HNO5S

NITROSYL SULFATE

NITROSYLSULFURIC ACID

NITROSYLSULPHURIC ACID

Nitrososulfuric acid

Sulfuric nitrous anhydride

Nitrosylsulfuric acid solution 40 wt. % in sulfuric acid

nitrosylsulfuricacid(40%in77%sulfuricacid)

nitrosylsulphuric

Nitrosylsulfuric acid 40% solution in sulfuric acid

Nitrosylsulfuric acid ISO 9001：2015 REACH

Nitrosylsulfuric Acid (40?wt. % in Sulfuric Acid)

high quality Nitrosylsulfuric acid

7782-78-7

7782-78-9

HNO5S

ONOSO3H

HO3SONO

Inorganic Acids

Synthetic Reagents

Dye intermediates

Chemical Synthesis

Inorganic Acids

Synthetic Reagents

Inorganics

pharmacetical