| Identification | More | [Name]
Tungstic acid | [CAS]
7783-03-1 | [Synonyms]
TUNGSTIC ACID
TUNGSTIC(VI) ACID
Wolframic acid
(beta-4)-tungstate(wo42-dihydrogen
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
Tungstate,dihydrogen
TUNGSTIC ACID 92.0-92.5%
TUNGSTIC ACID PURE
TUNGSTIC ACID, POWDER
TUNGSTIC ACID, 99.999%
TUNGSTIC ACID FREE ACID
TUNGSTIC ACID EXTRA PURE
TUNGSTIC ACID 99+%
TungsticAcidGr | [EINECS(EC#)]
231-975-2 | [Molecular Formula]
H2O4W | [MDL Number]
MFCD00011336 | [Molecular Weight]
249.85 | [MOL File]
7783-03-1.mol |
| Chemical Properties | Back Directory | [Appearance]
light yellow powder | [Melting point ]
100°C (dec.) | [Boiling point ]
1473°C | [density ]
5.5 g/mL at 25 °C(lit.)
| [refractive index ]
2.24 | [Fp ]
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 | [Stability:]
Stable. Incompatible with strong oxidizing agents. | [Water Solubility ]
insoluble | [Merck ]
14,9818 | [Exposure limits]
ACGIH: TWA 3 mg/m3
NIOSH: TWA 5 mg/m3; STEL 10 mg/m3 | [CAS DataBase Reference]
7783-03-1(CAS DataBase Reference) | [NIST Chemistry Reference]
Tungstic acid(7783-03-1) | [EPA Substance Registry System]
7783-03-1(EPA Substance) |
| Safety Data | Back Directory | [Risk Statements ]
R36/37/38:Irritating to eyes, respiratory system and skin . | [Safety Statements ]
S24/25:Avoid contact with skin and eyes . | [WGK Germany ]
3
| [RTECS ]
YO7840000
| [TSCA ]
Yes | [HS Code ]
28259011 |
| Questions And Answer | Back Directory | [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
|
| Hazard Information | Back Directory | [Chemical Properties]
light yellow powder | [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]
Notclassified |
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