There are many physical and chemical properties of sodium paratungstate (sodium paratungstate), mainly including:
The chemical formula of sodium paratungstate: Na10(H2W12O42)•27H2O
The molecular weight of sodium paratungstate: 3596.50
Specific gravity of sodium paratungstate: 3.987 (14°C)
Sodium paratungstate is a colorless triclinic crystal. Soluble in cold water, decompose in hot water. Heated to 100 ° C began to lose water.
In the solution, it roughly corresponds to the 12 aggregated state. Continue to add acid to polymerize to obtain iso-metatungstate ion and metatungstate. It is prepared by adding hydrochloric acid or nitric acid dropwise to sodium tungstate solution under strong stirring and heating conditions until the pH value reaches 5-6. Sodium tungstate is colorless crystal or white orthorhombic crystal, glossy flaky crystal or crystalline powder, sodium tungstate is soluble in water, the aqueous solution is slightly alkaline, insoluble in ethanol, slightly soluble in ammonia. Weathered in the air. When heated to 100°C, it loses crystal water and becomes anhydrous. React with strong acid (except hydrofluoric acid) to generate water-insoluble yellow tungstic acid; react with phosphoric acid or phosphate to generate phosphotungstic heteropoly acid complex; compound.
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