Sodium tungstate: Property

What is sodium tungstate?

Sodium tungstate is a colorless crystalline or white orthorhombic crystal, used as an analytical reagent and a precipitant for alkaloids. It can act as a fire retardant for fabrics, and is also used in the production of tungsten, tungstates, and tungsten oxides, as well as in mordants, pigments, and catalysts.

Sodium tungstate formula is Na2WO4. This white, water-soluble solid is the sodium salt of tungstic acid. It serves as a tungsten source for chemical synthesis and is an intermediate in the conversion of tungsten ore to metal.

What is another name for sodium tungstate?

Sodium tungstate has several synonyms:

• Disodium tetraoxotungstate
• Disodium tungstate
• Sodium tetraoxotungstate(VI)
• Sodium tungstate(VI)
• Sodium tungsten oxide
• Sodium wolframate
• Tungstic acid, disodium salt

Sodium tungstate structure

Sodium tungstate, with the formula Na2WO4, is typically found in the form of a dihydrate (Na2WO4·2H2O). Sodium tungstate cas number is 13472-45-2. Molecular weight of sodium tungstate is 293.82. The structure of sodium tungstate is shown below:

Sodium tungstate crystallizes in the monoclinic system, with WO4^2- anions surrounded by Na⁺ cations. The WO4^2- anion exhibits a tetrahedral geometry, with the tungsten atom at the center and bonded to four oxygen atoms. Each oxygen atom forms a double bond with the tungsten atom, giving the system high symmetry and stability.

Physical and Chemical Properties

Physical Properties

• Density: 2.3 g/mL at 25 °C (lit.)
• Melting Point: 3410 °C (lit.)
• Boiling Point: 5660 °C (lit.)
• Solubility: Soluble in water; insoluble in alcohol and acids.
• Color/Shape: White, rhombohedral | White crystalline powder or granules
• Decomposition: Releases toxic sodium oxide fumes upon heating.
• Water Solubility: Soluble

Reactivity

Treating sodium tungstate with hydrochloric acid yields tungsten trioxide or its acidic hydrate:

• Na2WO4 + 2 HCl → WO3 + 2 NaCl + H2O
• Na2WO4 + 2 HCl → WO3·H2O + 2 NaCl

This reaction can be reversed using sodium hydroxide solution.

Recommendations

Sodium tungstate, as an important inorganic compound, plays a key role in various fields due to its unique structure and properties. If you are interested in further information or purchasing sodium tungstate, it is recommended to visit Guidechem. Guidechem provides easy access to relevant information and purchasing options for sodium tungstate, catering to your research and industrial needs.

References:

• Han, Y, Gao, B, Xu, S. Study on the purity determination method of sodium tungstate. Journal of Tianjin University of Technology, 2001, 20(5): 45-47. DOI:10.3969/j.issn.1671-024X.2001.05.013.
• https://baike.baidu.com/item/%E9%92%A8%E9%85%B8%E9%92%A0
• https://en.wikipedia.org/wiki/Sodium_tungstate
• https://www.guidechem.com/encyclopedia/sodium-tungstate-dic17514.html
• https://pubchem.ncbi.nlm.nih.gov/Sodium_tungstate
• https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:63940