Silver sulfide
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| Silver sulfide | |
|---|---|
| Identifiers | |
| CAS number | [21548-73-2] |
| Properties | |
| Molecular formula | Ag2S |
| Molar mass | 247.8 g/mol |
| Appearance | Black cubic crystal |
| Melting point | |
| Solubility in water | 8.5−15g in 1L water |
| Thermochemistry | |
| Std enthalpy of formation ΔfH |
-32.6 kJ/mol |
| Standard molar entropy S |
144.0 J/mol·K |
| Hazards | |
| Main hazards | May cause irritation |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references |
|
Silver sulfide (or Silver sulphide in British English), Ag2S, is the sulfide of silver. It is black and constitutes the tarnish that forms on silver when exposed to the hydrogen sulfide of the atmosphere. It is found in nature as the minerals argentite and acanthite.
When formed on electrical contacts operating in an atmosphere rich in hydrogen sulfide, long filaments known as Silver Whiskers can form.
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