7783-03-1

Basic information

• Product Name: Tungstic acid
• Synonyms: dihydrogen,(T-4)-Tungstate;O2W(OH)2;Orthotungstic acid;Tungstate (WO42-), dihydrogen, (T-4)-;Tungstate (WO42-), dihydrogen, (T-4)-;Tungstate,dihydrogen,(T-4)-;Tunstic acid;Wolframic acid
• CAS NO: 7783-03-1
• Molecular Formula: H2O4W
• Molecular Weight: 249.85
• EINECS: 231-975-2
• Product Categories: Inorganics;AcidsMetal and Ceramic Science;Tungsten Salts;Electronic Chemicals;Micro/Nanoelectronics;Salts;metal oxide hydrate;catalyst of oil
• Mol File: 7783-03-1.mol
• Article Data: 0

Chemical Properties

• Melting Point: 100°C (dec.)
• Boiling Point: 1473°C
• Flash Point: 1473°C
• Appearance: Yellow to yellow-greenish/powder
• Density: 5.5 g/mL at 25 °C(lit.)
• Refractive Index: 2.24
• Storage Temp.: Sealed in dry,Room Temperature
• Water Solubility: insoluble
• Stability: Stable. Incompatible with strong oxidizing agents.
• Merck: 14,9818
• CAS DataBase Reference: Tungstic acid(CAS DataBase Reference)
• NIST Chemistry Reference: Tungstic acid(7783-03-1)
• EPA Substance Registry System: Tungstic acid(7783-03-1)

Safety Data

• Statements: 36/37/38
• Safety Statements: 24/25
• WGK Germany: 3
• RTECS: YO7840000
• TSCA: Yes
• Hazardous Substances Data: 7783-03-1(Hazardous Substances Data)

Usage

Description

Tungstic acid, also known as tungsten trioxide or wolframic acid, is a chemical compound with the formula H2WO4. It is a white crystalline solid that is soluble in water and exhibits acidic properties. Tungstic acid is an important precursor for the production of various tungsten compounds and materials, and it has a wide range of applications across different industries.

Uses

Used in Metal and Compound Production:
Tungstic acid is used as a starting material for preparing tungsten metal and many tungsten compounds. It plays a crucial role in the production of high-performance materials with unique properties, such as superalloys, catalysts, and electronic components.
Used in Textile Industry:
Tungstic acid is used as a mordant for textiles. A mordant is a substance that helps to fix dyes to fibers, improving the colorfastness and durability of dyed fabrics. Tungstic acid enhances the bonding between the dye and the fiber, resulting in more vibrant and long-lasting colors.
Used in Synthesis of Advanced Materials:
Tungstic acid is used as a starting material in the synthesis of polynanocomposite materials and polycrystalline ceramics. These advanced materials exhibit superior mechanical, thermal, and electrical properties, making them suitable for various high-performance applications, such as aerospace, electronics, and automotive industries.

Preparation

Tungstic acid is obtained as an intermediate in the recovery of tungsten from its minerals, scheelite and wolframite (See Tungsten). Also, the tungstic acid may be prepared by heating sodium tungstate with sulfuric acid or hydrochloric acid: Na2WO4 + 2HCl → H2WO4 + 2NaCl Na2WO4 + H2SO4 → H2WO4 + Na2SO4

Flammability and Explosibility

Notclassified

InChI:InChI=1/2H2O.2O.W/h2*1H2;;;/q;;;;+2/p-2/rH2O4W/c1-5(2,3)4/h1-2H