Sodium tungstate
- CAS No.
- 13472-45-2
- Chemical Name:
- Sodium tungstate
- Synonyms
- Na2WO4;TUNGSTEN METAL;AMMONIUM WOLFRAMATE;W HC 40;TUNGSTEN RIBBON;SODIUM TUNGSTATE;SODIUM TUNGSTATE;disodiumtungstate;SODIUMTUNGSTENATE;Tungstate, sodium
- CBNumber:
- CB1188314
- Molecular Formula:
- Na2WO4
- Molecular Weight:
- 293.82
- MOL File:
- 13472-45-2.mol
- MSDS File:
- SDS
- Modify Date:
- 2024/4/28 8:59:39
| Melting point | 3410 °C(lit.) |
|---|---|
| Boiling point | 5660 °C(lit.) |
| Density | 2.3 g/mL at 25 °C(lit.) |
| vapor pressure | 0Pa at 25℃ |
| solubility | H2O: soluble |
| form | wire |
| pka | 3.5[at 20 ℃] |
| color | white rhombohedral crystals, crystalline |
| Water Solubility | g/100g H2O: 71.5 (0°C), 73.0 (20°C), 97.2 (100°C) [LAN05] |
| Merck | 13,8772 |
| LogP | 0 |
| CAS DataBase Reference | 13472-45-2(CAS DataBase Reference) |
| EPA Substance Registry System | Sodium tungsten oxide (Na2WO4) (13472-45-2) |
Sodium tungstate Chemical Properties,Uses,Production
Chemical Properties
Sodium tungstate is a sodium salt of orthotungstate. It is a colorless crystals or white crystalline powder. Soluble in water; insoluble in alcohol and acids. noncombustible. Sodium tungstate has three crystalline forms, δ, γ and β. The transition temperature from δ to γ is about 570℃, and from γ to β is about 585℃. In hydrogen is heated to 700 ℃ also does not change, to 1100 ℃ will become metal tungsten.
Uses
Intermediate in preparation of tungsten compounds, (e.g., phosphotungstate), reagent, fire-proofing fabrics and cellulose, alkaloid precipitant.
Preparation
Sodium tungstate is obtained by digestion of tungsten ores, the economically important representatives of which are tungstates, in base. Illustrative is the extraction of sodium tungstate from wolframite:
Fe/MnWO4 + 2 NaOH + 2 H2O → Na2WO4?2H2O + Fe/Mn(OH)2
Sodium tungstate can also be produced by treating tungsten carbide with a mixture of sodium nitrate and sodium hydroxide in a fusion process which overcomes the high exothermicity of the reaction involved.
Definition
ChEBI: Sodium tungstate is an inorganic sodium salt having tungstate as the counterion. Combines with hydrogen peroxide for the oxidation of secondary amines to nitrones. It has a role as a reagent. It contains a tungstate.
Safety Profile
Poison by ingestion, intravenous, intramuscular, and subcutaneous routes. Experimental reproductive effects. Mutation data reported. When heated to decomposition it emits toxic fumes of Na2O. See also TUNGSTEN COMPOUNDS.
Sodium tungstate Preparation Products And Raw materials
Raw materials
Preparation Products
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| Shanghai Guoyuan Chemical Co., Ltd. | 58 |
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