Ammonium sulfide

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Ammonium sulfide
General
Systematic name	Ammonium sulfide
Other names	Ammonium bisulfide ammonium hydrogen sulfide ammonium hydrosulfide
Molecular formula	(NH4)2S
Molar mass	68.143 g/mol
Appearance	Yellow-orange fuming liquid.
CAS number
Properties
Density and phase	? g/ml, liquid.
Solubility in water	Infinitely soluble.
Melting point	-18°C (255.15 K)
Boiling point	40°C (313.15 K)
Basicity (pKb)	?
Viscosity	? cP at ?°C
Structure
Molecular shape	?
Coordination geometry	?
Dipole moment	? D
Hazards
MSDS	External MSDS
Main hazards	Highly toxic, explosive, highly flammable, corrosive.
NFPA 704
Flash point	22°C
R/S statement	R: R11, R23, R24, R25. S: ?
RTECS number	BS4900000
Supplementary data page
Structure and properties	n, εr, etc.
Thermodynamic data	Phase behaviour Solid, liquid, gas
Spectral data	UV, IR, NMR, MS
Related compounds
Other anions	Ammonium sulfate
Other cations	?
Related compounds	?
Except where noted otherwise, data are given for materials in their standard state (at 25°C, 100 kPa) [Chemical infoboxInfobox disclaimer and references]

Ammonium sulfide, (NH₄)₂S, is obtained, in the form of micaceous crystals, by passing hydrogen sulfide mixed with a slight excess of ammonia through a well-cooled vessel; the hydrosulfide NH₄·HS is formed at the same time. It dissolves readily in water, but is probably partially dissociated in solution. The hydrosulfide NH₄·HS can be obtained as a white solid, by mixing well-cooled ammonia with a slight excess of hydrogen sulfide. According to,W. P. Bloxam (Jour. of Chem. Soc., 1895, lxvii. p. 283) if hydrogen sulfide is passed into strong aqueous ammonia at ordinary temperature, the compound (NH₄)₂S·2NH₄HS is obtained, which, on cooling to 0°C and passing more hydrogen sulfide, forms the compound (NH₄)₂S·12NH₄HS. An ice-cold solution of this substance kept at 0°C and having hydrogen sulfide continually passed through it gives the hydrosulfide. Several complex polysulfides of ammonium have been isolated, for details of which see Bloxam's paper quoted above.

The common "stink bomb" consists of a solution of ammonium sulfide in water, sealed inside a glass ampoule. When the glass is broken, ammonia and hydrogen sulfide gases, both of which have a powerful unpleasant smell, are released from the solution.

References