Hydroxylamine

Identifiers & Physical Properties

CAS No.	11104-93-1
Molecular formula	H3NO
Average molar mass	33.03 g/mol
Monoisotopic mass	33.02146372 g/mol
SMILES	NO
InChIKey	AVXURJPOCDRRFD-UHFFFAOYSA-N
PubChem CID	787
ChEMBL	CHEMBL1191361
ChEBI	CHEBI:15429
EC No.	232-259-2
DTXSID	DTXSID7041043

Chemical & Physical Properties

XLogP	-1.2
Topological polar surface area	46.3
Hydrogen bond donors	2
Hydrogen bond acceptors	2
Rotatable bonds	0
Heavy atoms	2
Formal charge	0
Complexity	2
LogP (partition coefficient)	-1.5
Density	1.227 at 68 °F (USCG, 1999) - Denser than waterwill sink1.2 g/cm³Relative density of the vapour/air-mixture at 20 °C (air = 1): 1.00Density (at 20 °C): 1.12 g/cm³1.227 @25 °C1.227 g/cm3
Color/Form	Colorless cyrstalsLarge white flakes or white needles
Solubility	Very sol in water, liq ammonia, methanolsparingly sol in ether, benzene, carbon disulfide, chloroformSoluble in alcohol, acids, and cold waterSolubility in water at 20 °C: freely soluble
Flash point	265 °F (USCG, 1999)[ICSC] 265 °Fexplodes at 129 °C
Boiling point	133.7 °F 22 mm 158 °F 60 mm (USCG, 1999)70 °C at 60 mm Hg107 °C58 °C @760 [mm Hg]70 °C(Press: 60 Torr)
Decomposition	When heated to decomposition it emits toxic fumes of NOx /nitrogen oxides/.Decomposes rapidly at room temp. ... Decomposes in hot water.
Melting point	91.49 °F (USCG, 1999)33 °C8 °C34 °C
Vapor density	Relative vapor density (air = 1): 1.1
Vapor pressure	9.75 [mmHg]53 mm Hg at 32 °CVapor pressure, kPa at 47 °C: 1.3Vapor pressure, kPa at 20 °C: 1.453 [mm Hg] @32 °C
Physical Description	Hydroxylamine is an odorless white crystalline solid. Sinks and mixes with water. (USCG, 1999)LiquidHighly hygroscopic white solidUnstableQuickly decomposed at room temperature (especially by atmospheric moisture and carbon dioxide)mp = 33 deg C[Merck Index]VERY HYGROSCOPIC WHITE NEEDLES OR FLAKES.COLOURLESS SOLUTION IN WATER.
Stability/Shelf Life	UNSTABLERAPID DECOMP AT ROOM TEMP IN PRESENCE OF ATMOSPHERIC MOISTURE & CO2SLOWLY DECOMPOSED WHEN MOIST /HYDROXYLAMINE HYDROCHLORIDE/
pKa (acidity coefficient)	13.70±0.10(Predicted)

Safety & Regulations

Fire hazards
GHS classification	DangerH200: (Deleted) Unstable Explosive [Danger Explosives]H290: May be corrosive to metals [Warning Corrosive to Metals]H302: Harmful if swallowed [Warning Acute toxicity, oral]H312: Harmful in contact with skin [Warning Acute toxicity, dermal]H315: Causes skin irritation [Warning Skin corrosion/irritation]H317: May cause an allergic skin reaction [Warning Sensitization, Skin]H318: Causes serious eye damage [Danger Serious eye damage/eye irritation]H335: May cause respiratory irritation [Warning Specific target organ toxicity, single exposureRespiratory tract irritation]H351: Suspected of causing cancer [Warning Carcinogenicity]H373 **: May causes damage to organs through prolonged or repeated exposure [Warning Specific target organ toxicity, repeated exposure]H400: Very toxic to aquatic life [Warning Hazardous to the aquatic environment, acute hazard]P201, P202, P203, P234, P260, P261, P264, P264+P265, P270, P271, P272, P273, P280, P281, P301+P317, P302+P352, P304+P340, P305+P354+P338, P317, P318, P319, P321, P330, P332+P317, P333+P317, P362+P364, P372, P373, P380, P390, P391, P401, P403+P233, P405, P406, and P501 (click each P-code to see the statement)
Regulatory information	Chemical: HydroxylamineHydroxylamine is listed on the EPA's Chemical Data Reporting (CDR) system. Manufacturers and importers of Hydroxylamine are required to report information about their production and use of this chemical to the EPA under the Toxic Substances Control Act (TSCA). (40 eCFR Part 711)Status: Active Update: 02-06-2016 https://echa.europa.eu/registration-dossier/-/registered-dossier/16246Hydroxylamine: Does not have an individual approval but may be used under an appropriate group standardThe New Jersey Worker and Community Right to Know Act requires public and private employers to provide information about hazardous substances at their workplaces. (N.J.S.A. 34:5A-1 et. seq.)
Other safety information	IMAP assessments - Hydroxylamine and its salts: Human health tier II assessment
DOT label	Corrosive