Polonium sulfide
Chemical compound
From Wikipedia, the free encyclopedia
Polonium sulfide is an inorganic compound of polonium and sulfur with the chemical formula PoS.[3] The compound is radioactive and forms black crystals.[4]
| Names | |
|---|---|
| Other names
Polonium monosulfide[1] | |
| Identifiers | |
3D model (JSmol) |
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| Properties | |
| PoS | |
| Molar mass | 241.07 g/mol |
| Appearance | Black crystals |
| Melting point | 500 °C (932 °F; 773 K) |
| Insoluble[2] | |
| Related compounds | |
Related compounds |
Chromium(III) sulfide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Synthesis
1. Passing hydrogen sulfide through an acidic solution of a polonium(II) salt:[5][6]
- PoCl2 + H2S → PoS + 2 HCl
2. Reaction of ammonium sulfide aqueous solution with polonium(II) hydroxide:
- (NH4)2S + Po(OH)2 → 2 NH3 + 2 H2O + PoS
Physical properties
Polonium sulfide forms black solid crystals, insoluble in water, ammonium sulfide, ethanol, acetone, or toluene.
Chemical properties
Polonium sulfide has strong reducing properties and can be oxidized by chlorine water, bromine water, sodium hypochlorite, and aqua regia. Polonium sulfide is also unstable to heating. It decomposes into elemental polonium and elemental sulfur when heated to 274.85°C in a vacuum:[7]
- PoS → Po + S
Reacts with concentrated acids:
- PoS + 2 HCl → PoCl2 + H2S
Applications
Used in the isolation and purification of polonium.[citation needed]