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223328

Sigma-Aldrich

Tungstic acid

99%

Synonyme(s) :

dihydroxy(dioxo)tungsten

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100 G
131,00 $
500 G
490,00 $

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100 G
131,00 $
500 G
490,00 $

About This Item

Formule linéaire :
H2WO4
Numéro CAS:
7783-03-1
Poids moléculaire :
249.85
Numéro CE :
231-975-2
Numéro MDL:
MFCD00011336
Code UNSPSC :
12352300
ID de substance PubChem :
24853375
Nomenclature NACRES :
NA.23

131,00 $

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Essai

99%

Forme

powder

Densité

5.5 g/mL at 25 °C (lit.)

Chaîne SMILES 

O[W](O)(=O)=O

InChI

1S/2H2O.2O.W/h2*1H2;;;/q;;;;+2/p-2

Clé InChI

CMPGARWFYBADJI-UHFFFAOYSA-L

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Catégories apparentées

Description générale

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

Application

Starting material for the synthesis of a novel dimeric heteropolyoxopeoxotungstate which has potential in further studies of grafted polyoxoperoxo species on silica.[1]

Conditionnement

5 g packaged in glass bottles; 100 g, 500 g packaged in poly bottles

Pictogrammes

Exclamation mark
GHS07

Mention d'avertissement

Warning

Mentions de danger

H315,H319,H335

Classification des risques

Eye Irrit. 2 - Skin Irrit. 2 - STOT SE 3

Organes cibles

Respiratory system

Code de la classe de stockage

13 - Non Combustible Solids

Classe de danger pour l'eau (WGK)

WGK 3

Point d'éclair (°F)

Not applicable

Point d'éclair (°C)

Not applicable

Équipement de protection individuelle

Eyeshields, Gloves, type N95 (US)

Faites votre choix parmi les versions les plus récentes :

Certificats d'analyse (COA)

Lot/Batch Number
MKCV5378
MKCW3781
MKCW0168
MKCT4882
MKCT8693

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Ammonium metatungstate hydrate ≥85% WO3 basis (gravimetric)

Sigma-Aldrich

10035

Ammonium metatungstate hydrate

Tungsten powder, 12 μm, 99.9% trace metals basis

Sigma-Aldrich

267511

Tungsten

Ammonium metatungstate hydrate ≥66.5% (W)

Sigma-Aldrich

358975

Ammonium metatungstate hydrate

Piquemal, J-Y. et al.
Chemical Communications (Cambridge, England), 473-473 (1997)
P T Bilous et al.
Journal of bacteriology, 162(3), 1151-1155 (1985-06-01)
Escherichia coli grew anaerobically on a minimal medium with glycerol as the carbon and energy source and dimethyl sulfoxide (DMSO) as the terminal electron acceptor. DMSO reductase activity, measured with an artificial electron donor (reduced benzyl viologen), was preferentially associated
P C Schwindt et al.
Brain research, 291(1), 140-144 (1984-01-16)
Injection of tungstic acid gel (but not pH adjusted saline) into the cat lumbar ventral horn results in spontaneous, epileptiform activity consisting of waves of repetitive, high frequency, action potentials in motoneurons surrounding the injection site. In most motoneurons the
Renagul Abdurahman et al.
Analytica chimica acta, 658(1), 63-67 (2010-01-20)
In this study, a sensitive optical waveguide (OWG) sensor for the detection and identification of volatile organic compounds (VOCs) was reported. The sensing membrane is constructed by immobilization of peroxopolytungsten acid (PTA) thin film over a single-mode potassium ion (K(+))
R R Bridges et al.
Journal of analytical toxicology, 8(6), 263-268 (1984-11-01)
Common techniques for analyzing ethchlorvynol (Placidyl) by colorimetry and gas liquid chromatography are evaluated. Matrix effects are thoroughly examined to determine their contribution to the validity of results.
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Questions

1–4 of 4 Questions  

  1. How can I determine the shelf life / expiration / retest date of this product?

    1 answer

    1. If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
      For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
      For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
      For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/449/386/product-dating-information-mk.pdf

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  2. How is shipping temperature determined? And how is it related to the product storage temperature?

    1 answer

    1. Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf

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  3. Is it possible to have your product white instead of yellow? Thank you tungstic acid H2W04

    1 answer

    1. Unfortunately, a white tungctic acid product is not currently available. The white color is the result of a specific preparation method. Please see the link below to reivew a publication that may be helpful:
      http://www.cjcu.jlu.edu.cn/EN/Y1982/V3/I1/137

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  4. May I know the average particle size?

    1 answer

    1. The average particle size is not determined for this product.

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