Basic information
- Standard SMILES
[O]=[W](=[O])([OH])[OH]- InChIKey
CMPGARWFYBADJI-UHFFFAOYSA-L- Molecular formula
- W-H2-O4
- Average molar mass
- 249.85 g/mol
Overview
Tungstic acid is a tungsten coordination entity. It is a conjugate acid of a hydrogentungstate.
Names & identifiers
- Preferred name
- Tungstic acid
- IUPAC
- dihydroxy(dioxo)tungsten
- English name
- Tungstic acid
- Molecular formula
- HO4W-
- Molecular weight
- 248.84
Names & synonyms
Tungstic acidTungstic(VI) acidJ4D6K0RX2GCHEBI:36272tungsten acidRefChem:192539DTXCID0071964231-975-2DTXSID50149473Kyselina wolframova7783-03-1dihydroxy(dioxo)tungsten
Show more names
O2W(OH)2ungsticaciTunstic acidWolframic acidTungsticAcidGrTungstic acid 99%Orthotungstic acidTUNGSTIC ACID 99+%
Dihydrogen wolframateTungstic acid (H2WO4)Tungstic acid, 99%Tungstate (WO42-), dihydrogen, (T-4)-Tungsten hydroxide oxideUNII-J4D6K0RX2GEINECS 231-975-2Tungstate (WO42-), hydrogen (1:2), (T-4)-
Database identifiers
- CAS
7783-03-1- PubChem CID
- 1152
- ChEBI
CHEBI:36272- UNII
- J4D6K0RX2G
- EC Number
- 231-975-2
Properties
Computed structural properties
- Topological polar surface area
- 74.6 Ų
- Hydrogen bond donors
- 2
- Hydrogen bond acceptors
- 4
- Rotatable bonds
- 0
- Heavy atoms
- 5
- Formal charge
- 0
- Complexity
- 81.3
Experimental & physicochemical properties
Chemical ClassesMetals -> Metals, Inorganic Compounds
Density5.5 @25 °C
Physicochemical properties
- Melting point
- 100 °C · 100°C (dec.)
- Boiling point
- 1473 °C · 1473°C
- Density
- 5.5 g/mL · 5.5 g/mL at 25 °C (lit.)
- refractive index
- 2.24 · 2.24
- Flash point
- 1473 °C · 1473°C
- storage temp.
- Sealed in dry,Room Temperature
- solubility
- 2 O, · insoluble in H2O, acid solutions; soluble in alkaline solutions
- form
- powder
- color
- Yellow to yellow-greenish
- Specific Gravity
- 5.5 · 5.5
- Water Solubility
- insoluble
- Merck
- 14 · 14,9818
- Exposure limits
- 3 mg/m3NIOSH: · ACGIH: TWA 3 mg/m3NIOSH: TWA 5 mg/m3; STEL 10 mg/m3
- Stability
- Stable. Incompatible with strong oxidizing agents.
- InChI
- 1S/2H2O.2O.W/h2*1H2;;;/q;;;;+2/p-2
- InChIKey
- CMPGARWFYBADJI-UHFFFAOYSA-L
- SMILES
- O[W](O)(=O)=O
- CAS DataBase Reference
- 7783 · 7783-03-1(CAS DataBase Reference)
- EWG's Food Scores
- 1 · 1
- FDA UNII
- 4 D6K0RX2G · J4D6K0RX2G
- NIST Chemistry Reference
- Tungstic acid(7783-03-1)
- EPA Substance Registry System
- Tungstate (WO42-), dihydrogen, (T-4)- (7783-03-1)
- UNSPSC Code
- 12352300 · 12352300
- NACRES
- 23 · NA.23
- Symbol(GHS)
- 7 · GHS07
- Signal word
- Warning
- Hazard statements
- 315 · H315-H319-H335
- Precautionary statements
- 261 · P261-P264-P271-P280-P302+P352-P305+P351+P338
- target organs
- Respiratory system
- PPE
- 95 · Eyeshields, Gloves, type N95 (US)
- Risk Statements
- 36 · 36/37/38
- Safety Statements
- 24 · 24/25
- WGK Germany
- 3 · 3
- RTECS
- 7840000 · YO7840000
- TSCA
- TSCA listed
- HS Code
- 28259011 · 28259011
- Storage Class
- 13 · 13 - Non Combustible Solids
- Hazard Classifications
- 2 Skin · Eye Irrit. 2Skin Irrit. 2STOT SE 3
- REACH Registrations
- Active
Safety & regulation
GHS classification
GHS Classification
This chemical does not meet GHS hazard criteria for 96.6% (169 of 175) of all reports.
Not Classified
Aggregated GHS information provided per 175 reports by companies from 5 notifications to the ECHA C&L Inventory.
Hazard information
Regulatory Information
Chemical: Tungstate (WO42-), dihydrogen, (T-4)-
Status: Active Update: 12-04-2023 https://echa.europa.eu/registration-dossier/-/registered-dossier/11633
Tungstic acid: Does not have an individual approval but may be used under an appropriate group standard
Hazards SummaryA mild eye irritant; [RTECS] May cause eye injury; Harmful by ingestion, inhalation, and skin absorption; [MP Biomedicals MSDS] See Tungsten.
Hazard Classes and CategoriesNot Classified
Safety & protection
Threshold Limit Values (TLV)3.0 [mg/m3], as W, respirable particulate matter
Protective Action Criteria (PAC)
14 [mg/m3]
150 [mg/m3]
900 [mg/m3]
Safety data
- PPE
- Eyeshields, Gloves, type N95 (US)
- wgk
- 3
- tsca
- TSCA listed
- rtecs
- YO7840000
- hs_code
- 28259011
- risk_code
- 36/37/38
- Signal word
- Warning
- Symbol(GHS)
- GHS07
- safety_code
- 24/25
- Storage Class
- 13 - Non Combustible Solids
- target organs
- Respiratory system
- Hazard statements
- H315-H319-H335
- REACH Registrations
- Active
- Hazard Classifications
- Eye Irrit. 2Skin Irrit. 2STOT SE 3
- Precautionary statements
- P261-P264-P271-P280-P302+P352-P305+P351+P338
Chemistry & industry
Uses & manufacturing
General Manufacturing InformationTungstate (WO42-), hydrogen (1:2), (T-4)-: ACTIVE
Applications
UsesTungstic acid is used in preparing tungsten metal and many tungsten compounds. Also, it is a mordant for textiles.
UsesTungstic Acid is used as a starting material in the synthesis of polynanocomposite material and polycrystalline ceramics.
General DescriptionTungstic acid may be prepared by either digesting tungstate of lime or by treating tungsten with hydrochloric acid. 1
Preparation methods
PreparationTungstic 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
Upstream & downstream products
Upstream raw materials
Downstream products
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Additional notes
DefinitionChEBI: Tungstic acid is a tungsten coordination entity. It is a conjugate acid of a hydrogentungstate.
Related reactions
24 records
Linked notes
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