Ammonia, anhydrous

Endpoint summary

Additional information

Ammonia, anhydrous is a colourless gas.

The table below summarises the chemical and physical properties of ammonia, anhydrous.

Property	Value
Substance type	Inorganic compound
Appearance/physical state/colour	Colourless gas
Melting point	–78 C
Boiling point	–33 C
Density at 20°C	0.708 kg/m³
Particle size distribution	Study not required as the substance is marketed or used in a non-solid or granular form.
Vapour pressure at 20°C	8611 hPa
Partition Coefficient	Not required as test substance is inorganic. A log Kow: 0.23 has been calculated.
Water solubility at 20⁰C	482 g/L
Surface Tension at 25⁰C	Not required.
Flash point	The substance is inorganic so therefore the flash point does not need to be measured.
Auto flammability	651 °C
Flammability	Flammable
Explosiveness	There are no chemical groups associated with explosive properties.
Oxidising properties	No oxidising properties. The test substance does not contain any oxygen or halogen atoms
Stability in organic solvents and identity of relevant degradation products	The study does not need to be conducted if the substance is inorganic.
Dissociation constant at 25 °C	pKa = 9.25
Viscosity	The data requirement can be waived as the substance is a gas at room temperature and atmospheric pressure. However the viscosity of anhydrous ammonia was measured to 0.475, 0.317, 0.276 & 0.255 centipoises at -69, -50, -40 & -33.5  ⁰C respectively. The viscosity of aqueous ammonia (26%) is temperature-dependent and is reported to be between 0.7 -5 centipoise (mPa.s) at temperatures of between -40 and 48.9 degrees Celsius. The viscosity at 26.7 degrees Celsius is reported to be 1.1 centipoise (mPa.s).