CHEBI:25567 - nitrous acid

ChEBI IDCHEBI:25567
ChEBI Namenitrous acid
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Last Modified28 July 2014
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FormulaHNO2
Net Charge0
Average Mass47.013
Monoisotopic Mass47.00073
SMILES[H]ON=O
InChIInChI=1S/HNO2/c2-1-3/h(H,2,3)
InChIKeyIOVCWXUNBOPUCH-UHFFFAOYSA-N
Roles Classification
Chemical Roles:
inorganic acid  A Brønsted acid derived from one or more inorganic compounds. Inorganic acids (also known as mineral acids) form hydrons and conjugate base ions when dissolved in water.
Bronsted acid  A molecular entity capable of donating a hydron to an acceptor (Brønsted base).
Bronsted acid  A molecular entity capable of donating a hydron to an acceptor (Brønsted base).
ChEBI Ontology
Outgoing Relation(s)
nitrous acid (CHEBI:25567) is a nitrogen oxoacid (CHEBI:33455)
nitrous acid (CHEBI:25567) is conjugate acid of nitrite (CHEBI:16301)
Incoming Relation(s)
nitrites (CHEBI:25549) has functional parent nitrous acid (CHEBI:25567)
hyponitrite (CHEBI:24758) is a nitrous acid (CHEBI:25567)
nitrite (CHEBI:16301) is conjugate base of nitrous acid (CHEBI:25567)
nitrosooxy group (CHEBI:29786) is substituent group from nitrous acid (CHEBI:25567)
IUPAC Names 
hydrogen dioxonitrate(1−)
dioxonitric acid
nitrous acid
hydroxidooxidonitrogen
Synonyms  Source
HNO2IUPAC
[NO(OH)]IUPAC
nitrosyl hydroxideNIST Chemistry WebBook
Manual XrefsDatabases
C00088KEGG COMPOUND
NO2PDBeChem
Registry NumbersSources
Gmelin:983Gmelin
CAS:7782-77-6NIST Chemistry WebBook
CAS:7782-77-6ChemIDplus