Sodium tungstate dihydrate WO3:69%Min White crystalline powder RC00091

Manufacturer: Hangzhou Royalchem Co.,LTD.

Website:  www.cnroyalchem.com

Sodium Tungstate Dihydrate  (CAS No. 10213-10-2)

Product Name:  Sodium Tungstate Dihydrate
CAS Number:  10213-10-2
Chemical Formula:  Na₂WO₄·2H₂O
Molecular Weight:  329.86 g/mol
Synonyms:  Disodium tungstate dihydrate; Tungstic acid sodium salt dihydrate

Key Characteristics

Appearance:   W hite crystalline powder

Solubility:  Highly soluble in water (≈730 g/L at 20°C). Forms clear solutions. Insoluble in ethanol.

Purity:  Typically ≥99.0% (technical/reagent grade). Trace metal impurities (e.g., Mo, Fe, As) often controlled per application.

Density:  ~3.25 g/cm³.

Hygroscopicity:  Moderately hygroscopic; absorbs moisture from air. Store sealed.

pH (Aqueous Solution):  Alkaline (pH ~8–9 for 5% solution).

Melting Point:  Loses water of crystallization at ~100°C; decomposes to Na₂WO₄ and oxides at higher temperatures.

Applications

Catalysis:  Precursor for tungsten-based catalysts in oxidation reactions.

Chemical Synthesis:  Source of tungstate ions (WO₄²⁻) for producing tungsten oxides, tungsten metal powder, and tungsten bronzes.

Analytical Chemistry:  Used in spectrophotometric determination of proteins (Lowry method) and as a reagent for alkaloids.

Corrosion Inhibition:  Component in cooling water treatments and anti-corrosive coatings.

Textile Industry:  Fireproofing agent for fabrics and fibers.

Biochemistry:  Substitute for molybdate in microbial growth media studies.

Ceramics & Pigments:  Raw material for tungsten-containing ceramics and yellow pigments (e.g., cadmium tungstate).

Handling & Safety

Hazard Statements (GHS):

H315:  Causes skin irritation.

H319:  Causes serious eye irritation.

H335:  May cause respiratory irritation.

Precautionary Measures:

Wear PPE (gloves, goggles, mask).

Avoid dust formation. Use local exhaust ventilation.

Wash thoroughly after handling.

Storage:  Keep container tightly closed in a cool, dry, well-ventilated place. Separate from acids.

Environmental Impact:  Toxic to aquatic life (Tungsten compounds). Prevent release to waterways.

Packaging & Specifications

Common Packaging:  25 kg polyethylene-lined fiber drums, 1 kg bottles, or custom quantities.

Typical Specifications:

WO ₃  content: ≥ 6 9.0%

Insolubles: ≤0.01%

Chlorides (Cl⁻): ≤0.0 2 %

Sulfates (SO₄²⁻): ≤0.0 2 %

Heavy Metals (as Pb): ≤0.002%

Iron (Fe): ≤0.001%

Notes

Production involves alkaline digestion of tungsten ores (e.g., wolframite) followed by crystallization.

Solutions slowly decompose under strong UV light; store in amber glass if long-term stability is critical.