Ammonium sulfide is a salt with the formula ( N H 4 ) 2 S.
| Ammonium sulfide | |
|---|---|
| Are common | |
| Systematic name | ammonium sulfide |
| Chem. formula | (NH 4 ) 2 S |
| Rat formula | (NH 4 ) 2 S |
| Physical properties | |
| condition | yellow crystals |
| Molar mass | 68.154 g / mol |
| Density | 0.997 g / cm³ |
| Chemical properties | |
| Solubility in | 128.1 g / 100 ml |
| Classification | |
| Reg. CAS number | 12135-76-1 |
| PubChem | |
| Reg. EINECS number | |
| Smiles | |
| Inchi | |
| RTECS | |
| ChemSpider | |
| Security | |
| Toxicity |  3 3 2 W |
Content
Chemical Properties
Ammonium sulfide, being a salt of a weak base and a weak acid , decomposes with water as follows:
(NH 4 ) 2 S → 2NH 4 + + S 2-
NH 4 + + H 2 O ↔ NH 3 · H 2 O + H +
S 2- + H 2 O ↔ HS - + OH -
The slightly dissociated HS - anion and ammonia dissolved in water are formed. That is why in the solubility table this substance is marked with a dash.
Getting
Ammonium sulfide is obtained by the reaction of hydrogen sulfide with an excess of ammonia :
- H 2 S + 2 NH 3 → (NH 4 ) 2 S
Application
Ammonium sulfide is sometimes used in photography for manifestation, for patination of bronze and in the textile industry.
Security
Mixing ammonium sulfide with water is dangerous because toxic hydrogen sulfide is released .