nitrous acid

Also known as nitrosyl hydroxide, dioxonitric acid, hydroxidooxidonitrogen

chemical compound

Chemical data

Formula: HNO2
Molecular weight: 47.014 g/mol
IUPAC name: nitrous acid
SMILES: N(=O)O
InChIKey: IOVCWXUNBOPUCH-UHFFFAOYSA-N
XLogP: -0.3
Polar surface area: 49.7 Å²
H-bond donors: 1
H-bond acceptors: 3
Formal charge: 0

via PubChem

Research

30,868 papers

Improving wastewater management using free nitrous acid (FNA).Water research · 2020
Understanding the influence of free nitrous acid on microalgal-bacterial consortium in wastewater treatment: A critical review.Bioresource technology · 2022
Potential of free nitrous acid (FNA) for sludge treatment and resource recovery from waste activated sludge: A review.Journal of environmental management · 2024
Understanding the Effect of Free Nitrous Acid on Biofilms.Environmental science & technology · 2022
Genetic effects of nitrous acid.Mutation research · 1977

via PubMed

Wikidata facts

Mass: 47.001

Show 6 more facts

chemical formula: HNO₂
Commons category: Nitrous acid
canonical SMILES: N(=O)O
melting point: 42.35
pKa: 3.2
boiling point: 158

Sources (5)

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Article

Nitrous acid (molecular formula HNO 2) is a weak and monoprotic acid known only in solution, in the gas phase, and in the form of nitrite (NO 2) salts. It was discovered by Carl Wilhelm Scheele, who called it "phlogisticated acid of niter". Nitrous acid is used to make diazonium salts from amines. The resulting diazonium salts are reagents in azo coupling reactions to give azo dyes.

Structure