Ammonium sulfide

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Ammonium sulfide
IUPAC name
Ammonium sulfide
Other names
Diammonium sulfide
3D model (JSmol)
ECHA InfoCard 100.032.009
RTECS number BS4900000
UN number 2683 (solution)
Molar mass 68.154 g/mol
Appearance yellow crystals (> −18 °C)[1]
Density 0.997 g/cm3
Melting point decomposes at ambient temperatures
128.1 g/100 mL
Solubility soluble in alcohol
very soluble in liquid ammonia
Safety data sheet External MSDS
Corrosive (C)
Dangerous for the environment (N)
R-phrases (outdated) R31, R34, R50
S-phrases (outdated) (S1/2), S26, S45, S61
NFPA 704
Flammability code 3: Liquids and solids that can be ignited under almost all ambient temperature conditions. Flash point between 23 and 38 °C (73 and 100 °F). E.g., gasoline Health code 3: Short exposure could cause serious temporary or residual injury. E.g., chlorine gas Reactivity code 3: Capable of detonation or explosive decomposition but requires a strong initiating source, must be heated under confinement before initiation, reacts explosively with water, or will detonate if severely shocked. E.g., fluorine Special hazards (white): no codeNFPA 704 four-colored diamond
Flash point 32.22 °C (90.00 °F; 305.37 K)
Related compounds
Other anions
Ammonium hydroxide
Other cations
Sodium sulfide
Potassium sulfide
Related compounds
Ammonium hydrosulfide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
YesY verify (what is YesYN ?)
Infobox references

Ammonium sulfide, also known as diammonium sulfide, is an unstable salt with the formula (NH4)2S. Aqueous solutions purporting to contain this salt are commercially available, with a pKa exceeding 15,[2] the hydrosulfide ion cannot be deprotonated to an appreciable amount by ammonia. Thus, such solutions mainly consist of a mixture of ammonia and (NH4)SH. Ammonium sulfide solutions are used occasionally in photographic developing, to apply patina to bronze, and in textile manufacturing. Also, due to its offensive smell, it is the active ingredient in a variety of foul pranks including the common stink bomb.

It can be used as a selective reducing agent (cf Clonitazene), where there are two nitro groups only one of them is selectively reduced.


Solutions of "ammonium sulfide" are hazardous as labile sources of toxic hydrogen sulfide.[3]


  1. ^ Pradyot Patnaik. Handbook of Inorganic Chemicals. McGraw-Hill, 2002, ISBN 0-07-049439-8
  2. ^ Meyer B, Ward K, Koshlap K, Peter L "Second dissociation constant of hydrogen sulfide" Inorganic Chemistry', (1983). volume 22, pp. 2345.doi:10.1021/ic00158a027
  3. ^ J. T. Baker: MSDS for Ammonium Sulfide