hydroxylamine

Inorganic compound

Chemical compoundtype of chemical entityQ259997

Also known as nitrinous acid · aminol · azanol

Formula: NH₂OH
Mass: 33.0215 Da
Melting point: 33.1°C
1
Sources
1.Stated in Basic Laboratory and Industrial Chemicals: A CRC Quick Reference Handbook
View statement on Wikidata ↗
Boiling point: 58°C
1
Sources
1.Stated in Basic Laboratory and Industrial Chemicals: A CRC Quick Reference Handbook
View statement on Wikidata ↗

Overview

From Wikipedia, the free encyclopedia · Read full article · Text CC BY-SA 4.0

Hydroxylamine is an inorganic compound with the chemical formula NH2OH. The compound exists as hygroscopic colorless crystals. Hydroxylamine is almost always provided and used as either an aqueous solution or, more often, as one of its salts, such as hydroxylammonium sulfate, a water-soluble solid.

Overview

Chemistry

Computed by PubChem CID 787 (NIH) · Public domain

Molecular formula: H3NO
Molecular weight: 33.03 g/mol
IUPAC name: hydroxylamine
SMILES: NO
InChIKey: AVXURJPOCDRRFD-UHFFFAOYSA-N
XLogP: -1.2
Topological polar surface area: 46.3 Å²
H-bond donors / acceptors: 2 / 2
Complexity: 2

Chemistry

All data

82 statements · 35% with external sources · numbers in brackets are citations

Canonical SMILES: NO
1
Sources
1.Stated in PubChem
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Members / parts: nitrogen
hydrogen
oxygen
primary amino group
hydroxyl
PKa: 5.97 temperature: unknown
1
Sources
1.Stated in Correlation of the Base Strengths of Amines 1
View statement on Wikidata ↗
Safety classification and labelling: NFPA 704: Standard System for the Identification of the Hazards of Materials for Emergency Response nfpa health: 2 · nfpa fire: 1 · nfpa instability: 3
Part of: ammonia monooxygenase activity
1
Sources
1.Stated in Gene Ontology release 2020-05-02
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aspartyltransferase activity
1
Sources
1.Stated in Gene Ontology release 2020-05-02
View statement on Wikidata ↗
hydroxylamine oxidase activity
1
Sources
1.Stated in Gene Ontology release 2020-05-02
View statement on Wikidata ↗
hyponitrite reductase activity
1
Sources
1.Stated in Gene Ontology release 2020-05-02
View statement on Wikidata ↗
hydroxylamine reductase activity
1
Sources
1.Stated in Gene Ontology release 2020-05-02
View statement on Wikidata ↗
hydroxylamine reductase (NADH) activity
1
Sources
1.Stated in Gene Ontology release 2020-05-02
View statement on Wikidata ↗
Found in taxon: Caenorhabditis elegans
1
Sources
1.Stated in Modeling Meets Metabolomics-The WormJam Consensus Model as Basis for Metabolic Studies in the Model Organism
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tomato
1
Sources
1.Stated in Metabolomic analysis of tomato seed germination
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Arabidopsis thaliana
2
Sources
1.Stated in Origanum vulgare essential oils inhibit glutamate and aspartate metabolism altering the photorespiratory pathway in Arabidopsis thaliana seedlings
2.Stated in Isolation and characterization of a D-cysteine desulfhydrase protein from Arabidopsis thaliana
View statement on Wikidata ↗
Conjugate acid: hydroxylammonium ion
Subclass of: inorganic compound
nitrogen compound
hydroxy compound
Electric dipole moment: 0.59 debye
1
Sources
1.Stated in Basic Laboratory and Industrial Chemicals: A CRC Quick Reference Handbook
View statement on Wikidata ↗
Ionization energy: 10 eV
1
Sources
1.Stated in Basic Laboratory and Industrial Chemicals: A CRC Quick Reference Handbook
View statement on Wikidata ↗
Different from: ammonia solution applies to name of subject: NH2OH · applies to name of object: NH4OH

On other databases

46 identifiers linking hydroxylamine across the web's reference databases

Data quality

statements

35%

externally sourced

Source last edited October 14, 2026. AIDB refreshes this page daily.

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AIDB. (2026). hydroxylamine (Q259997). Retrieved from https://aidb.si/e/hydroxylamine-Q259997