Tungsten trioxide
Tungsten(VI) oxide, also known as tungsten trioxide is a chemical compound of oxygen and the transition metal tungsten, with formula WO3. The compound is also called tungstic anhydride, reflecting its relation to tungstic acid H2WO4. It is a light yellow crystalline solid.
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| IUPAC name
Tungsten trioxide | |
| Other names
Tungstic anhydride Tungsten(VI) oxide Tungstic oxide | |
| Identifiers | |
3D model (JSmol) |
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| ECHA InfoCard | 100.013.848 |
PubChem CID |
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CompTox Dashboard (EPA) |
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| Properties | |
| WO3 | |
| Molar mass | 231.84 g/mol |
| Appearance | Canary yellow powder |
| Density | 7.16 g/cm3 |
| Melting point | 1,473 °C (2,683 °F; 1,746 K) |
| Boiling point | 1,700 °C (3,090 °F; 1,970 K) approximation |
| insoluble | |
| Solubility | slightly soluble in HF |
| −15.8·10−6 cm3/mol | |
| Structure | |
| Monoclinic, mP32 | |
| P121/n1, No. 14 | |
| Octahedral (WVI) Trigonal planar (O2– ) | |
| Hazards | |
| Occupational safety and health (OHS/OSH): | |
Main hazards |
Irritant |
| Flash point | Non-flammable |
| Safety data sheet (SDS) | External MSDS |
| Related compounds | |
Other anions |
Tungsten trisulfide |
Other cations |
Chromium trioxide Molybdenum trioxide |
| Tungsten(III) oxide Tungsten(IV) oxide | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references | |
Tungsten(VI) oxide occurs naturally in the form of hydrates, which include minerals: tungstite WO3·H2O, meymacite WO3·2H2O and hydrotungstite (of the same composition as meymacite, however sometimes written as H2WO4). These minerals are rare to very rare secondary tungsten minerals.
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