Ammonium sulfide

Ammon sulfide

Colorless to yellowish -smelling hydrogen sulfide crystals

Fixed

1.00 g · cm -3 ( 20 ° C)

Thermal decomposition temperature: -18 ° C

439.5 hPa

1280 g · l in water (20 ° C)

Risk

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Ammonium sulphide is an ammonium salt of the hydrogen sulfide. It has the formula ( NH4) 2S and belongs to the class of sulfides.

Occurrence

In nature, it occurs as a product of putrefaction.

Production and representation

Ammonium sulfide can be obtained by the reaction of ammonia ( as a gas or in solution) with hydrogen sulfide.

The constitutive equation is:

Ion notation:

Use

Ammonium sulfide is widely used in inorganic chemistry, for qualitative analysis, in order to precipitate the cation separation process in the ammonium sulfide group to an unknown sample, the heavy metal cations of the elements nickel, cobalt, iron, manganese, chromium, aluminum and zinc as a group to separate and using Detecting Reactions to identify.

Frequently ammonium sulfide is ( as well as ammonium hydrosulfide and ammonium polysulphides ) is part of the so-called stink bombs, which are placed in glass vials in the trade. This use is banned in Germany (Annex 1 of the Commodities Regulation ).

The salt reacts with water to form hydrogen sulfide (HS- ) and hydroxide ions. An aqueous solution of ammonium sulfide is therefore only stable in neutral and weakly alkaline environment - in acids escaping hydrogen sulfide gas, ammonia gas in concentrated alkaline solutions.