Ammonium Sulfide

Title: Ammonium Sulfide
CAS Registry Number: 12135-76-1
Additional Names: True ammonium sulfide
Molecular Formula: H8N2S
Molecular Weight: 68.14
Percent Composition: H 11.83%, N 41.11%, S 47.06%
Line Formula: (NH4)2S
Literature References: Prepn: Gmelins, Ammonium (8th ed.) 23, p 246 (1936). Prepn of high purity soln: Johnson et al., Chemist-Analyst 53, 46 (1964).
Properties: Forms crystals below -18°; at high temps it dec into NH4HS, NH3, polysulfides, etc.
Use: To apply patina to bronze, in photographic developers, in textile manufacture, in trace metal analysis.
Ammonium Sulfide Solution, Red Ammonium Sulfide Solution, Yellow Ammonium Sulfite Ammonium Tetrachloroaluminate Ammonium Tetrachlorozincate

Ammonium sulfide
CAS number 12135-76-1 YesY
PubChem 25519
ChemSpider 23808 YesY
UN number 2683 (solution)
RTECS number BS4900000
Jmol-3D images Image 1
Molecular formula (NH4)2S
Molar mass 68.154 g/mol
Appearance yellow crystals (> −18 °C)[1]
Density 0.997 g/cm3
Melting point decomposes at ambient temperatures
Solubility in water 128.1 g/100 mL
Solubility soluble in alcohol
very soluble in liquid ammonia
MSDS External MSDS
EU Index 016-008-00-2
EU classification Corrosive (C)
Dangerous for the environment (N)
R-phrases R31, R34, R50
S-phrases (S1/2), S26, S45, S61
NFPA 704
NFPA 704.svg
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
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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.