Basic information Physical Properties Uses Preparation Safety Supplier Related
ChemicalBook >  Product Catalog >  Inorganic chemistry >  Inorganic acid >  Tungstic acid

Tungstic acid

Basic information Physical Properties Uses Preparation Safety Supplier Related

Tungstic acid 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:
7783-03-1
MF:
HO4W-
MW:
248.84
EINECS:
231-975-2
Product Categories:
  • metal oxide hydrate
  • Inorganics
  • AcidsMetal and Ceramic Science
  • Tungsten Salts
  • Electronic Chemicals
  • Micro/Nanoelectronics
  • Salts
  • catalyst of oil
Mol File:
7783-03-1.mol
More
Less

Tungstic acid Chemical Properties

Melting point:
100°C (dec.)
Boiling point:
1473°C
Density 
5.5 g/mL at 25 °C (lit.)
refractive index 
2.24
Flash point:
1473°C
storage temp. 
Sealed in dry,Room Temperature
solubility 
insoluble in H2O, acid solutions; soluble in alkaline solutions
form 
powder
color 
Yellow to yellow-greenish
Specific Gravity
5.5
Water Solubility 
insoluble
Merck 
14,9818
Exposure limits
ACGIH: TWA 3 mg/m3
NIOSH: TWA 5 mg/m3; STEL 10 mg/m3
Stability:
Stable. Incompatible with strong oxidizing agents.
CAS DataBase Reference
7783-03-1(CAS DataBase Reference)
NIST Chemistry Reference
Tungstic acid(7783-03-1)
EPA Substance Registry System
Tungstate (WO42-), dihydrogen, (T-4)- (7783-03-1)
More
Less

Safety Information

Risk Statements 
36/37/38
Safety Statements 
24/25
WGK Germany 
3
RTECS 
YO7840000
TSCA 
Yes
HS Code 
28259011

MSDS

More
Less

Tungstic acid Usage And Synthesis

Physical Properties

Yellow amorphous powder; density 5.59 g/cm3; decomposes at 100°C; insoluble in water and most acids; soluble in hydrofluoric acid, caustic alkalies and ammonia solution. Freshly prepared tungstic acid containing a molecule of water of crystallization is moderately soluble in water.

Uses

Tungstic acid is used in preparing tungsten metal and many tungsten compounds. Also, it is a mordant for textiles.

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

Chemical Properties

light yellow powder

Physical properties

Yellow amorphous powder; density 5.59 g/cm3; decomposes at 100°C; insoluble in water and most acids; soluble in hydrofluoric acid, caustic alkalies and ammonia solution. Freshly prepared tungstic acid containing a molecule of water of crystallization is moderately soluble in water.

Uses

Tungstic Acid is used as a starting material in the synthesis of polynanocomposite material and polycrystalline ceramics.

Definition

ChEBI: Tungstic acid is a tungsten coordination entity. It is a conjugate acid of a hydrogentungstate.

General Description

Tungstic acid may be prepared by either digesting tungstate of lime or by treating tungsten with hydrochloric acid. 1

Flammability and Explosibility

Not classified

Tungstic acidSupplier

Shanghai Boyle Chemical Co., Ltd.
Tel
021-50182298 021-50180596
Email
sales@boylechem.com
J & K SCIENTIFIC LTD.
Tel
010-82848833 400-666-7788
Email
jkinfo@jkchemical.com
Meryer (Shanghai) Chemical Technology Co., Ltd.
Tel
021-61259108 18621169109
Email
market03@meryer.com
3B Pharmachem (Wuhan) International Co.,Ltd.
Tel
821-50328103-801 18930552037
Email
3bsc@sina.com
Alfa Aesar
Tel
400-6106006
Email
saleschina@alfa-asia.com