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Ammonium chloride
IUPAC name Ammonium chloride
Other names Sal ammoniac, Salmiac, Nushadir salt, Sal armagnac, Salt armoniack, Salmiak
CAS number 12125-02-9
PubChem 25517
EC number 235-186-4
KEGG D01139
RTECS number BP4550000
SMILES [Cl-].[NH4+]
Molecular formula H4ClN
Molar mass 53.49 g mol-1
Appearance White solid, hygroscopic
Odor Odorless
Density 1.519 g/cm3
Melting point

338 °C, 611 K, 640 °F

Boiling point

520 °C, 793 K, 968 °F

Sublimes at 337.6 °C
ΔsublHo = 176.1 kJ/mol
Solubility in water 244 g/L (−15 °C)
294 g/L (0 °C)
383.0 g/L (25 °C)
454.4 g/L (40 °C)
740.8 g/L (100 °C)
Solubility product (Ksp)
30.9 (395 g/L)
Solubility Soluble in liquid ammonia, hydrazine,
Slightly soluble in acetone
Insoluble in diethyl ether, ethyl acetate
Solubility in methanol 32 g/kg (17 °C)
33.5 g/kg (19 °C)
35.4 g/kg (25 °C)
Solubility in ethanol 6 g/L (19 °C)
Solubility in glycerol 97 g/kg
Solubility in sulfur dioxide 0.09 g/kg (0 °C)
0.031 g/kg (25 °C)
Solubility in acetic acid 0.67 g/kg (16.6 °C)
Vapor pressure 133.3 Pa (160.4 °C)
6.5 kPa (250 °C)
33.5 kPa (300 °C)
Acidity (pKa) 9.24
-36.7·10−6 cm3/mol
Refractive index (nD) 1.642 (20 °C)
Crystal structure CsCl, cP2
Space group Pm3m, No. 221
Lattice constant a = 0.3876 nm
Std enthalpy of
formation ΔfHo298
−314.43 kJ/mol
Standard molar
entropy So298
94.56 J/mol·K
Specific heat capacity, C 84.1 J/mol·K
ATC code
NFPA 704

NFPA 704.svg

Flash point Non-flammable
U.S. Permissible
exposure limit (PEL)
Related compounds
Other anions Ammonium fluoride
Ammonium bromide
Ammonium iodide
Other cations Sodium chloride
Potassium chloride
Hydroxylammonium chloride
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)

Ammonium chloride is a chemical compound composed of ammonium and chloride ions. It is a colorless crystalline compound. It is used in soldering. It is also used as an electrolyte in the Leclanche cell, a type of primary cell. Ammonium chloride can be deprotonated by strong bases such as sodium hydroxide to produce ammonia gas.It is sublime compound.

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