Tungstic acid CAS7783-03-1

Details:

Density 5.5g /mL at 25 °C(lit.)
Boiling point 1473°C
Melting point 100°C (dec.
Molecular formula H2O4W
Molecular weight 249.854
Flash point 1473°C
Accurate mass 249.946213
PSA 74.60000
Appearance character light yellow powder
Refractive index 2.24
Storage condition
Store in a cool, ventilated and dry storeroom. The packing container is in good condition.

stability
It 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.

Dehydration begins at 100℃, boiling point 1473℃. It is burned at high temperature and converted to tungsten trioxide. Insoluble in cold water and most acids, slightly soluble in hot water, soluble in alkali, hydrofluoric acid and ammonia. Solution of n-tungstate or paratungstate is treated with dilute acid to obtain colloidal tungstate, which contains different amounts of water and has greater solubility and activity in water than yellow tungstate. Powdery white tungstic acid has higher activity than yellow tungstic acid. It can be prepared by adding tungstate solution to dilute nitric acid solution.

Yellow tungstic acid is used to make metallic tungsten powder, and white tungstic acid in powder form can be used to prepare metatungstate and tungsten-containing heteropoly salts.

Water is insoluble
Molecular structure
1. Molar refractive index: useless

2, molar volume (cm3/mol) : no use

3, equal volume (90.2K) : no use

4. Surface tension (dyne/cm) : unavailable

5. Dielectric constant: unavailable

6. Polarizability (10-24cm3) : unavailable

7. Single isotope mass: 249.946209 Da

8. Nominal quality: 250 Da

9. Average quality: 249.8535 Da

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