Ammonia

CAS 7664-41-7H3N17.031 g/mol

Ammonia is an azane that consists of a single nitrogen atom covelently bonded to three hydrogen atoms. It has a role as a NMR chemical shift reference compound, a metabolite, a neurotoxin, a nucleophilic reagent, a mouse metabolite, an EC 3.5.1.4 (amidase) inhibitor and a refrigerant. It is a gas molecular entity, an azane and a mononuclear parent hydride. It is a conjugate base of an ammonium. It is a conjugate acid of an azanide.

IUPAC: azane

PubChem

Physical & Chemical Properties

Physical and chemical properties
Melting Point	-107.9 °F (EPA, 1998)
Boiling Point	-28.03 °F at 760 mmHg (EPA, 1998)
Density	0.6818 at -28.03 °F (EPA, 1998) - Less dense than water; will float
Solubility	34 % (NIOSH, 2024)
Flash Point	132 °C (270 °F) - closed cup
Vapor Pressure	400 mmHg at -49.72 °F (EPA, 1998)
pH	pH of 1.0N aqueous solution 11.6; 0.1N aqueous solution 11.1; 0.01N aqueous solution 10.6
Appearance	Ammonia solutions (containing more than 35% but not more than 50% ammonia) appears as a clear colorless liquid consisting of ammonia dissolved in water. Corrosive to tissue and metals. Although ammonia is lighter than air, the vapors from a leak will initially hug the ground. Long term exposure to low concentrations or short term exposure to high concentrations may result in adverse health conditions from inhalation. Prolonged exposure of containers to fire or heat may result in their violent rupturing and rocketing.