Chemical Properties
white to slightly yellow crystalline powder or
Uses
Sodium tungstate dihydrate may be used in the preparation of aqueous sols of tungsten oxide dihydrate.
Uses
Sodium tungstate dihydrate is currently being investigated as a potential therapy for obesity. Sodium tungstate dihydrate is also an inhibitor of acid phosphatases.
Uses
Fireproofing and waterproofing fabrics; preparing complex Compounds such as phosphotungstate and silicotungstate; as a protective colloid in biological development methods; precipitant for alkaloids; catalyst in oxidation reactions; corrosion inhibitor for steel.
Definition
ChEBI: A hydrate that is the dihydrate form of sodium tungstate. Combines with hydrogen peroxide for the oxidation of secondary amines to nitrones
General Description
Sodium tungstate dihydrate is a sodium salt of tungstic acid, which occurs as white colorless crystals.
reaction suitability
reagent type: catalyst
core: tungsten
Synthesis
Sodium tungstate can be obtained by reacting tungsten trioxide with sodium hydroxide solution, followed by evaporative crystallization, centrifugal dehydration and drying.
WO3+2NaOH+H2ONa2WO42H2O
Purification Methods
The salt crystallises from hot water (0.8mL/g) on cooling to 0o. [Grüttner & Jender in Handbook of Preparative Inorganic Chemistry (Ed. Brauer) Academic Press Vol II p 1727 1965].
