Tungstic Acid Basic Information

CAS: 7783-03-1

Chinese name: tungstic acid

Common name: (T-4)-Dihydrotungstic acid; Tungstic acid; Tungstic acid; Tungstic (VI) acid; Tungstic acid, 99.999% TRACE METALS BASIS; Tungstic acid (>98%, BC)

English alias: (beta-4)-tungstate(wo42-dihydrogen;dihydrogen, (T-4)-Tungstate;O2W(OH)2;Orthotungstic acid;Tungstate (WO42-), dihydrogen, (T-4)-;Tungstate (WO42-), dihydrogen, (T-4)-;Tungstate, dihydrogen , (T-4)-; Tunstic acid

Chemical Formula: H2O4W

Molecular weight: 249.85

Physical and chemical properties

[Density]: 5.5 g/mL at 25 ℃ (lit.)

[Boiling point]: 1473°C

[ Melting point ]: 100°C (dec.)

[ Chemical Formula ]: H₂O4W

[Molecular Weight]: 249.854

[Flash point]: 1473°C

[exact mass]: 249.946213

[PSA]: 74.60000

[Appearance]: Pale yellow powder

[Refractive Index]: 2.24

[ Storage conditions ]:

It should be stored in a cool, ventilated and dry warehouse. The packaging container is intact.

[Stability]:

Will not decompose if used and stored according to specifications. Slightly soluble in hot water, soluble in alkali, hydrofluoric acid and ammonia, almost insoluble in acid.

It starts dehydration at 100°C, and its boiling point is 1473°C. Burning at high temperature transforms into tungsten trioxide. Insoluble in cold water and most acids, slightly soluble in hot water, soluble in alkali, hydrofluoric acid and ammonia. Orthotungstic acid or paratungstic acid solution can be treated with dilute acid to obtain colloidal tungstic acid, which contains different amounts of water, and its solubility and activity in water are greater than that of yellow tungstic acid. Powdery white tungstic acid is more active than yellow tungstic acid. It can be prepared by adding dilute nitric acid solution to tungstate solution.

Yellow tungstic acid is used to make metal tungsten powder, and powdered white tungstic acid can be used to prepare metatungstate and tungsten-containing heteropolysalt.

[Water solubility]: insoluble

[ Molecular Structure ]:

1. Molar refractive index: no available
2. Molar volume (cm³/mol): no available
3. Isotonic specific volume (90.2K): no available
4. Surface tension (dyne/cm): no available
5. Dielectric constant: no available
6. Polarizability (10⁻²⁴cm³): no available
7. Monoisotope mass: 249.946209 Da
8. Nominal mass: 250 Da
9. Average mass: 249.8535 Da

[ More ]:

1. Characters: It can exist in various states. Yellow powder or crystal, etc.
2. Density (g/mL 25°C): 5.5
3. Relative vapor density (g/mL, air=1): not determined
4. Melting point (°C): 100
5. Boiling point (°C, normal pressure): 1473
6. Boiling point (°C, 5.2kPa): not determined
7. Refractive index (n20/D): 2.24
8. Flash point (℃,): 1473
9. Specific rotation (º): not determined
10. Autoignition point or ignition temperature (°C): not determined
11. Vapor pressure (kPa, 25°C): not determined
12. Saturated vapor pressure (kPa, 60°C): not determined
13. Heat of combustion (KJ/mol): not determined
14. Critical temperature (°C): not determined
15. Critical pressure (KPa): Undetermined
16. The logarithmic value of the oil-water (octanol/water) partition coefficient (25°C): not determined
17. Explosive upper limit (%, V/V): Undetermined
18. Lower explosion limit (%, V/V): not determined
19. Solubility (mg/mL): Soluble in hydrofluoric acid, slowly soluble in caustic alkali solution, insoluble in water and other acids

Tungstic Acid Safety Information

[ Personal protective equipment ]: Eyeshields; Gloves; type N95 (US); type P1 (EN143) respirator filter

[Risk Statement (Europe)]: R36/37/38

[Safety Statement (Europe)]: S24/25

[Dangerous Goods Transport Code]: NONH for all modes of transport

[WGK Germany]: 3

[RTECS number]: YO7840000

More details of tungstic acid product, please visit website: tungstic-acid.com
Please contact CHINATUNGSTEN for inquiry and order of tungstic acid:
Email: sales@chinatungsten.com
Tel.: 86 592 5129595