Name | Sodium Tungstate Dihydrate |
Synonyms | SODIUM TUNGSTATE 2H2O Sodiumtungstatedihydrate SODIUM TUNGSTATE-2-HYDRATE TUNGSTIC ACID NA-SALT 2H2O SODIUM TUNGSTATE DIHYDRATE Sodium Tungstate Dihydrate SODIUM TUNGSTATE(VI) DIHYDRATE Tungsticaciddisodiumsaltdihydrate TUNGSTIC ACID SODIUM SALT DIHYDRATE |
CAS | 10213-10-2 |
EINECS | 600-275-2 |
InChI | InChI=1/2Na.2H2O.4O.W/h;;2*1H2;;;;;/q2*+1;;;;;2*-1;/r2Na.O4W.2H2O/c;;1-5(2,3)4;;/h;;;2*1H2/q2*+1;-2; |
InChIKey | WPZFLQRLSGVIAA-UHFFFAOYSA-N |
Molecular Formula | H4Na2O6W |
Molar Mass | 329.85 |
Density | 4.18 |
Melting Point | 698°C(lit.) |
Water Solubility | 730 g/L (20 ºC) |
Solubility | Soluble in water, insoluble in alcohol, slightly soluble in ammonia. |
Appearance | White crystal |
Specific Gravity | 3.25 |
Color | White to slightly yellow |
Odor | Odorless |
Exposure Limit | ACGIH: TWA 3 mg/m3NIOSH: TWA 1 mg/m3; STEL 3 mg/m3 |
Maximum wavelength(λmax) | ['λ: 260 nm Amax: ≤0.120', , 'λ: 280 nm Amax: ≤0.035'] |
Merck | 14,8698 |
PH | 9.5-11.5 (25℃, 1M in H2O) |
Storage Condition | Store at +15°C to +25°C. |
MDL | MFCD00149190 |
Physical and Chemical Properties | Properties of colorless crystals or white orthorhombic crystals. melting point 698 ℃ relative density 3.25 solubility soluble in water, slightly alkaline. Insoluble in ethanol, slightly soluble in ammonia. |
Use | Used in the manufacture of metal tungsten, tungstic acid, tungstate, dyes, inks, catalysts, etc |
Hazard Symbols | Xn - Harmful |
Risk Codes | R22 - Harmful if swallowed R36/38 - Irritating to eyes and skin. R36 - Irritating to the eyes |
Safety Description | S36 - Wear suitable protective clothing. S37/39 - Wear suitable gloves and eye/face protection S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S39 - Wear eye / face protection. |
WGK Germany | 1 |
RTECS | YO7900000 |
TSCA | Yes |
HS Code | 28418000 |
Toxicity | LD50 (mg tungstate/kg) in rabbits: 105 i.m.; in rats: 240 s.c. (Venugopal, Luckey) |
Raw Materials | Sodium hydroxide Hydrochloric acid |
Downstream Products | Light Fast Violet Lake |
Reference Show more | 1. Lu, Jun, et al. "Evaluation of antioxidant and antibacterial properties of extracts from Trollius chinensis Bunge." European Food Research and Technology 240.2 (2015): 301-310.https://doi.org/10.1007/s00217-014-2329-2 2. [IF=4.452] Onome Ejeromedoghene et al."Intrinsic structural/morphological and photochromic responses of WO3 co-doped MoO3 nanocomposites based on varied drying methods."Drying Technology. 2021 Jul 21 |
colorless crystal or white crystalline powder. Melting point 665 C; d 3.23. Can stroke in dry air. Soluble in about 1.1 parts of water, the solution is weak alkaline, pH 8~9. Insoluble in alcohol and acid. Loss of water of crystallization at 100 °c.
excess tungstic acid was added to sodium hydroxide solution, heated, stirred and filtered, the filtrate was concentrated until crystals were precipitated, cooled and filtered to obtain pure sodium tungstate.
Analytical reagents for serum protein, protein-free serum filtrate, Alkaloid precipitation. It is also used in the manufacture of metal tungsten, tungstic acid and tungstate. It can also be used as mordant, pigment and catalyst, fabric fire retardant, etc.
rabbit intramuscular LDso:105mg (tungstate)/kg; Rat subcutaneous LD50: 240mg (tungstate)/kg. Should be stored in a cool, dry warehouse. Do not break the drum and keep the packaging intact. Pay attention to moisture. It should not be stored and mixed with acids, and should be protected against rain and sunlight during transportation.