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Names | |||
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IUPAC name
Azinous acid
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Preferred IUPAC name
Hydroxylamine (only preselected[1]) | |||
Other names
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Identifiers | |||
3D model (JSmol)
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3DMet | |||
ChEBI | |||
ChEMBL | |||
ChemSpider | |||
ECHA InfoCard | 100.029.327 | ||
EC Number |
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478 | |||
KEGG | |||
MeSH | Hydroxylamine | ||
PubChem CID
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RTECS number |
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UNII | |||
CompTox Dashboard (EPA)
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Properties | |||
NH2OH | |||
Molar mass | 33.030 g·mol−1 | ||
Appearance | Vivid white, opaque crystals | ||
Density | 1.21 g cm−3 (at 20 °C)[2] | ||
Melting point | 33 °C (91 °F; 306 K) | ||
Boiling point | 58 °C (136 °F; 331 K) /22 mm Hg (decomposes) | ||
Soluble | |||
log P | −0.758 | ||
Acidity (pKa) | 6.03 ([NH3OH]+) | ||
Basicity (pKb) | 7.97 | ||
Structure | |||
Tricoordinated at N, dicoordinated at O | |||
Trigonal pyramidal at N, bent at O | |||
0.67553 D | |||
Thermochemistry | |||
Heat capacity (C)
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46.47 J/(K·mol) | ||
Std molar
entropy (S⦵298) |
236.18 J/(K·mol) | ||
Std enthalpy of
formation (ΔfH⦵298) |
−39.9 kJ/mol | ||
Hazards | |||
GHS labelling: | |||
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Danger | |||
H200, H290, H302, H312, H315, H317, H318, H335, H351, H373, H400 | |||
P201, P202, P234, P260, P261, P264, P270, P271, P272, P273, P280, P281, P301+P312, P302+P352, P304+P340, P305+P351+P338, P308+P313, P310, P312, P314, P321, P322, P330, P332+P313, P333+P313, P362, P363, P372, P373, P380, P390, P391, P401, P403+P233, P404, P405, P501 | |||
NFPA 704 (fire diamond) | |||
Flash point | 129 °C (264 °F; 402 K) | ||
265 °C (509 °F; 538 K) | |||
Lethal dose or concentration (LD, LC): | |||
LD50 (median dose)
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408 mg/kg (oral, mouse); 59–70 mg/kg (intraperitoneal mouse, rat); 29 mg/kg (subcutaneous, rat)[3] | ||
Safety data sheet (SDS) | ICSC 0661 | ||
Related compounds | |||
Related hydroxylammonium salts
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Related compounds
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Hydroxylamine (also known as hydroxyammonia) is an inorganic compound with the chemical formula NH2OH. The compound is in a form of a white hygroscopic crystals.[4] Hydroxylamine is almost always provided and used as an aqueous solution. It is consumed almost exclusively to produce Nylon-6. The oxidation of NH3 to hydroxylamine is a step in biological nitrification.[5]
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