Tags: Chemical Compound, Chemical Substance.
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.