Tungstate,dihydrogen,(T-4)-
Tungstic acid
CAS: 7783-03-1
Molecular Formula: HO4W-
Tungstate,dihydrogen,(T-4)- - Names and Identifiers
| Name | Tungstic acid |
| Synonyms | O2W(OH)2 Tunstic acid Tungstic acid Wolframic acid Tungstic(VI) acid Orthotungstic acid dihydroxy(dioxo)tungsten dihydrogen,(T-4)-Tungstate Tungstate,dihydrogen,(T-4)- Tungstate (WO42-), dihydrogen, (T-4)- |
| CAS | 7783-03-1 |
| EINECS | 231-975-2 |
| InChI | InChI=1/2H2O.2O.W/h2*1H2;;;/q;;;;+2/p-2/rH2O4W/c1-5(2,3)4/h1-2H |
Tungstate,dihydrogen,(T-4)- - Physico-chemical Properties
| Molecular Formula | HO4W- |
| Molar Mass | 248.84 |
| Density | 5.5 g/mL at 25 °C (lit.) |
| Melting Point | 100°C (dec.) |
| Boling Point | 1473°C |
| Flash Point | 1473°C |
| Water Solubility | insoluble |
| Solubility | Soluble in hydrofluoric acid, slowly soluble in caustic solution, insoluble in water and other acids. |
| Appearance | powder |
| Specific Gravity | 5.5 |
| Color | Yellow to yellow-greenish |
| Exposure Limit | ACGIH: TWA 3 mg/m3NIOSH: TWA 5 mg/m3; STEL 10 mg/m3 |
| Merck | 14,9818 |
| Storage Condition | Sealed in dry,Room Temperature |
| Stability | Stable. Incompatible with strong oxidizing agents. |
| Sensitive | Easily absorbing moisture |
| Refractive Index | 2.24 |
| MDL | MFCD00011336 |
| Physical and Chemical Properties | yellow powder. density 5.5 |
| Use | Mainly used in the production of metal tungsten, tungsten wire, hard alloy, tungstate, can also be used as printing and dyeing additives |
Tungstate,dihydrogen,(T-4)- - Risk and Safety
| Risk Codes | 36/37/38 - Irritating to eyes, respiratory system and skin. |
| Safety Description | 24/25 - Avoid contact with skin and eyes. |
| WGK Germany | 3 |
| RTECS | YO7840000 |
| TSCA | Yes |
| HS Code | 28259011 |
Tungstate,dihydrogen,(T-4)- - Upstream Downstream Industry
| Raw Materials | Nitric acid Hydrochloric acid |
| Downstream Products | (2R,3R)-2,3-Dihydroxybernsteinsaeure Sodium dodecatungstophosphate hydrate |
Tungstate,dihydrogen,(T-4)- - Introduction
When heated to 100-110 ℃, it slowly becomes dehydrated (2WO3 · H2O), and the high heat changes from nWO3 · H2O to tungsten trioxide. It's irritating.
Last Update：2022-10-16 17:28:44
Tungstate,dihydrogen,(T-4)- - Reference Information
| NIST chemical information | information provided by: webbook.nist.gov (external link) |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| toxicity | see tungsten trioxide. |
| Application | is mainly used for making metal tungsten, tungsten wire, cemented carbide, tungstate, it can also be used as printing and dyeing auxiliaries mordant for textile industry, and also used for the preparation of tungsten and tungsten filaments mainly used for making metal tungsten, tungsten filaments, tungstate, cemented carbide, etc. Also used as a petrochemical catalyst, printing and dyeing auxiliaries and lubricants. |
| production method | The solution is filtered by the decomposition method of calcium tungstate-hydrochloric acid after grinding the tungsten ore and sodium hydroxide, after purification, it is subjected to metathesis reaction with calcium chloride solution to obtain calcium tungstate, and then treated with hydrochloric acid, and the produced tungstic acid is washed, dried and pulverized to obtain a tungstic acid product. MnWO4? FeWO4 4NaOH→2Na2WO4 Fe(OH)2? Mn(OH)2Na2WO4 CaCl2 → CaWO4 2NaClCaWO4 2HCl → H2WO4 CaCl2 ammonium paratungstate-hydrochloric acid decomposition method after alkaline hydrolysis with sodium hydroxide, with hydrochloric acid, ammonium chloride solution, filtered and washed, the refined ammonium tungstate solution is obtained, and then hydrochloric acid is hydrolyzed to obtain tungstic acid. After dehydration, drying and pulverization, the tungstic acid product is obtained. MnWO4? FeWO4 4NaOH→2Na2WO4 Fe(OH)2? Mn(OH)212Na2WO4 14HCl→5Na2O? 12WO3 14NaCl 7 H2O5Na2O? 12WO3 10NH4Cl → 5(NH4)2O? 12WO3 10 naca5 (NH4)2O? 12WO3 10HCI 7H2O→12H2WO4 10NH4Cl |
Last Update：2024-04-10 22:29:15
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Raw Materials for Tungstate,dihydrogen,(T-4)-
Downstream Products for Tungstate,dihydrogen,(T-4)-