Nitrosyl sulfuric acid

Structural formula
General
Surname	Nitrosyl sulfuric acid
other names	Nitrosyl hydrogen sulfate Lead chamber crystals
Molecular formula	NOHSO 4
Brief description	colorless pungent smelling crystals
External identifiers / databases
CAS number 7782-78-7 EC number 231-964-2 ECHA InfoCard 100,029,058 PubChem 82157 Wikidata Q419812
properties
Molar mass	127.08 g mol −1
Physical state	firmly
Melting point	Decomposes at 73.5 ° C
safety instructions
GHS labeling of hazardous substances danger H and P phrases H: 314 EUH: 014-029 P: 280-305 + 351 + 338-310
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Nitrosyl sulfuric acid is a chemical compound with the formula (NO) HSO ₄ . The salt is a source of the nitrosyl ion (NO ⁺ ) and belongs to the group of hydrogen sulfates .

Occurrence

Ionic form of nitrosylsulfuric acid

Nitrosylsulfuric acid is produced, for example, when cleaning exhaust gases ( flue gas ) from the metalworking industry when wet cleaning processes with sulfuric acid are used.

Extraction and presentation

Nitrosylsulfuric acid is formed when nitrogen oxides react with concentrated sulfuric acid (e.g. as a by-product in the lead chamber process ). It can also be obtained by reacting nitric acid with sulfuric acid or by introducing sulfur dioxide into nitric acid.

${\displaystyle \mathrm {HNO_{2}+\ H_{2}SO_{4}\longrightarrow \ NOHSO_{4}+\ H_{2}O} }$

${\displaystyle \mathrm {SO_{2}+\ HNO_{3}\longrightarrow \ NOHSO_{4}} }$

use

Nitrosyl sulfuric acid is used:

• for the production of caprolactam , dyes and pesticides
• for the diazotization of amines (as a substitute for nitrosylsulfuric acid, other NO ⁺ -relating compounds such as nitrosyl tetrafluoroborate [NO] BF ₄ or nitrosyl chloride can be used).

Individual evidence

1. ↑ ^{a b c d} Entry on nitrosylsulphuric acid in the GESTIS substance database of the IFA , accessed on January 9, 2019(JavaScript required) .
2. ↑ G. Brauer (Ed.), Handbook of Preparative Inorganic Chemistry 2nd ed., Vol. 1, Academic Press 1963, p. 406.