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Ammonia Structure


Chemical Properties

Melting point −78 °C(lit.)
Boiling point 60 °C
Density  1.023 g/mL at 25 °C
vapor density  0.6 (vs air)
vapor pressure  8.75 atm ( 21 °C)
Flash point 52 °F
storage temp.  0-6°C
solubility  Miscible with ethanol (95%) and water.
form  Liquid
pka 38(at 25℃)
color  Colorless
Odor Intense pungent odor detectable at 17 ppm
Odor Threshold 1.5ppm
explosive limit 25%
Water Solubility  soluble
Sensitive  Hygroscopic
Merck  14,492
BRN  3587154
Henry's Law Constant 1.31 at 0 °C, 2.92 at 20 °C (droplet train apparatus, Shi et al., 1999)
Exposure limits TLV-TWA 25 ppm (~18 mg/m3) (ACGIH and MSHA), 50 ppm (OSHA); STEL 35 ppm; IDLH 500 ppm (NIOSH).
Stability Stable. Hygroscopic. Flammable. Incompatible with acids, strong oxidizing agents. May react violently with acids, aldehydes, alkylene oxides, amides, boron, boron halides, calcium, chlorine azide, chloric acid, chlorine monoxide, chlorites, halogens, heavy metals and many other materials - check the complete data sheet before use!
LogP 0.23 at 20℃
FDA 21 CFR 573.180; 175.105; 310.545
Indirect Additives used in Food Contact Substances AMMONIA
CAS DataBase Reference 7664-41-7(CAS DataBase Reference)
EWG's Food Scores 2-6
NCI Dictionary of Cancer Terms ammonia
NIST Chemistry Reference Ammonia(7664-41-7)
EPA Substance Registry System Ammonia (7664-41-7)


Signal wordDanger
Hazard statements H280-H314-H331-H410
Precautionary statements P260-P273-P280-P303+P361+P353-P304+P340+P311-P305+P351+P338+P310
Hazard Codes  F,N,T,Xn
Risk Statements  11-20-36/37/38-67-39/23/24/25-23/24/25-10-50-34-23-36-66-40-36/37-19
Safety Statements  26-7-45-36/37/39-16-9-61-36/37
RIDADR  UN 1219 3/PG 2
WGK Germany  2
RTECS  BO0875000
Autoignition Temperature 690 °C
DOT Classification 2.2 (Non-flammable gas)
HazardClass  3
PackingGroup  II
HS Code  28141000
Hazardous Substances Data 7664-41-7(Hazardous Substances Data)
Toxicity LD50 oral (rat) 350 mg/kg
LC50 inhal (rat) 2000 ppm (4 h)
PEL (OSHA) 35 ppm (27 mg/m3)
TLV-TWA (ACGIH) 25 ppm (17 mg/m3)
STEL (ACGIH) 35 ppm (27 mg/m3)
IDLA 300 ppm
NFPA 704:
3 0

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