|UN number||2683 (solution)|
|Molar mass||68.154 g/mol|
|Appearance||yellow crystals (> −18 °C)
|Melting point||decomposes at ambient temperatures|
|128.1 g/100 mL|
|Solubility||soluble in alcohol
very soluble in liquid ammonia
|EU classification||Corrosive (C)
Dangerous for the environment (N)
|R-phrases||R31, R34, R50|
|S-phrases||(S1/2), S26, S45, S61|
|Flash point||32.22 °C (90.00 °F; 305.37 K)|
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
|what is: / ?)(|
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, 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 2 nitro groups only one of them is selectively reduced.