The chemical formula of sodium paratungstate (Sodium Paratungstate) is Na10(H2W12O42)•27H2O, the molecular weight is 3596.50, and the specific gravity is 3.987 (14°C). 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. Sodium paratungstate is roughly equivalent to 12 aggregates in the solution, and can be obtained by adding acid and polymerizing isometatungstate ions and metatungstate. 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.
The preparation method of sodium paratungstate: It is prepared by adding hydrochloric acid or nitric acid dropwise to the sodium tungstate solution under the condition of strong stirring and heating until the pH value reaches 5-6.
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