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223328

Sigma-Aldrich

Wolframsäure

99%

Synonym(e):

dihydroxy(dioxo)tungsten

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100 G
CHF 125.00
500 G
CHF 373.00

CHF 125.00

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100 G
CHF 125.00
500 G
CHF 373.00

About This Item

Lineare Formel:
H2WO4
CAS-Nummer:
7783-03-1
Molekulargewicht:
249.85
EG-Nummer:
231-975-2
MDL-Nummer:
MFCD00011336
UNSPSC-Code:
12352300
PubChem Substanz-ID:
24853375
NACRES:
NA.23

CHF 125.00

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Qualitätsniveau

100

Assay

99%

Form

powder

Dichte

5.5 g/mL at 25 °C (lit.)

SMILES String

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

InChI

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

InChIKey

CMPGARWFYBADJI-UHFFFAOYSA-L

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Allgemeine Beschreibung

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

Anwendung

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

Verpackung

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

Piktogramme

Exclamation mark
GHS07

Signalwort

Warning

Gefahreneinstufungen

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

Zielorgane

Respiratory system

Lagerklassenschlüssel

13 - Non Combustible Solids

WGK

WGK 3

Flammpunkt (°F)

Not applicable

Flammpunkt (°C)

Not applicable

Persönliche Schutzausrüstung

Eyeshields, Gloves, type N95 (US)

Hier finden Sie alle aktuellen Versionen:

Analysenzertifikate (COA)

Lot/Batch Number
MKCV5378
MKCW3781
MKCW0168
MKCT8693
MKCT4882

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1 of 3

Ammoniummetawolframat Hydrat ≥85% WO3 basis (gravimetric)

Sigma-Aldrich

10035

Ammoniummetawolframat Hydrat

Wolfram powder, 12 μm, 99.9% trace metals basis

Sigma-Aldrich

267511

Wolfram

Ammoniummetawolframat Hydrat ≥66.5% (W)

Sigma-Aldrich

358975

Ammoniummetawolframat Hydrat

Piquemal, J-Y. et al.
Chemical Communications (Cambridge, England), 473-473 (1997)
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(+))
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
Chao-yang Tu et al.
Guang pu xue yu guang pu fen xi = Guang pu, 25(6), 804-807 (2005-10-06)
Cr3+:Al2(WO4)3 Crystal was grown from the Na2WO4 solvent system by using the TSSG method. The absorption spectrum shows that there are two strong absorption wideband peaks and one we ak absorption peak belonging to Cr3+ ion in the crystal. The
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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

      Helpful?

  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

      Helpful?

  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

      Helpful?

  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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