Tungstic acid

Synonym(s):Tungstic(VI) acid

CAS NO.：7783-03-1
Empirical Formula: HO4W-
Molecular Weight: 248.84
MDL number: MFCD00011336
EINECS: 231-975-2
SAFETY DATA SHEET (SDS)
Update Date: 2024-08-12 15:55:19

What is Tungstic acid?

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.

The Uses of Tungstic acid

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

Properties of Tungstic acid

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)

Safety information for Tungstic acid

Signal word	Warning
Pictogram(s)	Exclamation Mark Irritant GHS07
GHS Hazard Statements	H315:Skin corrosion/irritation H319:Serious eye damage/eye irritation H335:Specific target organ toxicity, single exposure;Respiratory tract irritation
Precautionary Statement Codes	P261:Avoid breathing dust/fume/gas/mist/vapours/spray. P264:Wash hands thoroughly after handling. P264:Wash skin thouroughly after handling. P271:Use only outdoors or in a well-ventilated area. P280:Wear protective gloves/protective clothing/eye protection/face protection. P302+P352:IF ON SKIN: wash with plenty of soap and water. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.