Hydroxylamine

  • Oxammonium
Formula
H3NO
Structure
Description
Odorless white crystalline solid.
Uses
As reducing agent in photography, in synthetic & analytical chemistry, as antioxidant for fatty acids & soaps hydroxylamine hydrochloride.

Registry Numbers and Inventories.
CAS
7803-49-8
EC (EINECS/ELINCS)
232-259-2
EC Index Number
612-122-00-7
EC Class
Heating may cause an explosion; Harmful; Irritant; Sensitising; Dangerous for the Environment
R 5 22 48/22 37/38 41 43 50
S 26 36/37/39 61
RTECS
NC2975000
RTECS class
Mutagen
UN (DOT)
3287
Merck
13,4853
Beilstein/Gmelin
478 (G)
Swiss Giftliste 1
G-1694
Canada DSL/NDSL
NDSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
H3NO
Formula mass
33.02
Boiling point, °C
56 - 57
Vapor pressure, mmHg
179 (25 C)
Vapor density (air=1)
1.1
Density
1.227 g/cm3 (20 C)
Solubility in water
Very soluble
Refractive index
1.39 (20 C)
pKa/pKb
5.97
Partition coefficient, pKow
-0.81
Heat of vaporization
34.9 kJ/mol

Hazards and Protection.
Storage
Protect against physical damage. Store at in cool noncombustible buildings and separate from oxidizing materials.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Avoid inhalation or ingestion of dust. Wear protective clothing including clean overalls, cap, gloves, and goggles. Skin which has been exposed should be washed immediately with soap and water.
Respirators
Canister type mask recommended unless intense heat necessitates use of self-contained apparatus.
Small spills/leaks
Neutralizing Agents for Acids and Caustics: Sodium bisulfate
Stability
Explosive under confinement.
Incompatibilities
Reaction with zinc or calcium produces explosive bishydroxylamides React vigorously with hypochlorites, pyridine, carbonyls.

Fire.
Flash Point,°C
-18
Autoignition, °C
265
Fire fighting
Fire Extinguishing Agents: Use extreme caution - material may explode. Use remote extinguishing equipment or unmanned fixed turret and hose nozzles - evacuate area.
Fire potential
Very flammable. Combustion probable.
Combustion products
Nitrogen oxides - toxic fumes - react with water or steam to produce heat and corrosive liquids - can react violently with reducing materials.
Health
2
 
Flammability
2
 

Health.
Poison_Class
3
Exposure effects
Fatal overdose in animals produced seizures, then paralysis of the respiratory muscles and death. Vertigo, headache, and restlessness may also be seen. No data were available to assess the potential effects of exposure to this agent during pregnancy or lactation. <br>Malformations have been seen in rabbits.
   Ingestion
Nausea and vomiting may occur.
   Inhalation
Fatal overdose in animals produced paralysis of the respiratory muscles, dyspnea, cyanosis, apnea, and death.
   Skin
Repeated exposures may increase risk of allergic reactions such as eczema to exposed surfaces such as hands and forearms. Dermatitis may occur, and a reddening of hair and exposed skin. It may be irritating or corrosive to the

First aid
 
   Ingestion
Seek medical attention. If individual is drowsy or unconscious, do not give anything by mouth; place individual on the left side with the head down. Contact a physician, medical facility, or poison control center for advice about whether to induce vomiting. If possible, do not leave individual unattended.
   Inhalation
If symptoms develop, move individual away from exposure and into fresh air. If symptoms persist, seek medical attention. If breathing is difficult, administer oxygen. Keep person warm and quiet; seek immediate medical attention.
   Skin
Wash with soap and water immediately.
   Eyes
Flush with water.

Transport.
UN number
3287
Response guide
USCG CHRIS Code
HDA