Tungsten trisulfide
Chemical compound
From Wikipedia, the free encyclopedia
Tungsten trisulfide is an inorganic compound of tungsten and sulfur with the chemical formula WS3.[1][2] The compound looks like chocolate-brown powder.[3][4]
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| Other names
Tungsten(VI) sulphide, tris(sulfanylidene)tungsten | |
| Identifiers | |
3D model (JSmol) |
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| Properties | |
| WS3 | |
| Molar mass | 280.038 g/mol |
| Appearance | Brown solid |
| Related compounds | |
Related compounds |
Tungsten disulfide |
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. Bubbling hydrogen sulfide through hot acidified solution of tungstenates.[5]
2. Reaction of tungsten disulfide and elemental sulfur on heating:[6]
- WS2 + S → WS3
3. Precipitates upon acidification of thiotungstate solutions:[5]
- (NH4)2WS4 + HCl → WS3 + 2 NH4Cl + H2S
- Na2WS4 + H2SO4 → WS3 + Na2SO4 + H2S
Physical properties
Slightly soluble in cold water and forms colloidal solution in hot water.
Soluble in alkali metal carbonates and alkali metal hydroxides.[3]
Chemical properties
Tungsten trisulfide can be decomposed by heating into tungsten disulfide and elemental sulfur:
- WS3 → WS2 + S
Reacts with sulfide solutions:
- WS3 + (NH4)2S → (NH4)2WS4
Reduced by hydrogen:
- WS3 + 3H2 → W + 3 H2S