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223336

Sigma-Aldrich

Sodium tungstate dihydrate

ACS reagent, ≥99%

Sinónimos:

Tungstic acid sodium salt dihydrate

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About This Item

Fórmula lineal:
Na2WO4 · 2H2O
Número de CAS:
10213-10-2
Peso molecular:
329.85
Número CE:
236-743-4
Número MDL:
MFCD00149190
Código UNSPSC:
12352302
ID de la sustancia en PubChem:
329752303
NACRES:
NA.21
Ensayo:
≥99%
grado:
ACS reagent
Formulario:
crystalline powder
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grado

ACS reagent

Nivel de calidad

200

Ensayo

≥99%

Formulario

crystalline powder

idoneidad de la reacción

reagent type: catalyst
core: tungsten

impurezas

≤0.01% insolubles
≤0.02 meq/g Titr. free base

pH

9-11.5 (20 °C, 100 g/L)

mp

698 °C (lit.)

trazas de anión

chloride (Cl-): ≤0.005%
sulfate (SO42-): ≤0.01%

trazas de catión

Mo: ≤0.001%
heavy metals and iron (as Pb): ≤0.001%

cadena SMILES

O.O.[Na+].[Na+].[O-][W]([O-])(=O)=O

InChI

1S/2Na.2H2O.4O.W/h;;2*1H2;;;;;/q2*+1;;;;;2*-1;

Clave InChI

WPZFLQRLSGVIAA-UHFFFAOYSA-N

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Descripción general

Sodium tungstate dihydrate is a hydrated sodium salt of tungstic acid. It participates as a catalyst in the preparation of various epoxides.[1] Various crystallographic properties of sodium tungstate dihydrate have been analyzed.[2]

Aplicación

Combines with hydrogen peroxide for the oxidation of secondary amines to nitrones.[3]
Sodium tungstate dihydrate (Na2WO4.2H2O) may be employed in the following studies:
  • As a derivatization reagent for the determination of hydrogen peroxide by a fluorimetric method.[4]
  • Synthesis of N-hydroxy-desferrioxamine B, a metabolite of the microbial product desferrioxamine B.[5]
  • Preparation of highly crystalline CaMoO4, SrMoO4, CaWO4 and SrWO4 nanoparticles.[6]
Sodium tungstate dihydrate may be used in the preparation of aqueous sols of tungsten oxide dihydrate.[7]

Pictogramas

Exclamation mark
GHS07

Palabra de señalización

Warning

Frases de peligro

H302

Clasificaciones de peligro

Acute Tox. 4 Oral

Código de clase de almacenamiento

13 - Non Combustible Solids

Clase de riesgo para el agua (WGK)

WGK 2

Punto de inflamabilidad (°F)

Not applicable

Punto de inflamabilidad (°C)

Not applicable

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Certificados de análisis (COA)

Lot/Batch Number
MKCW6442
MKCW1520
MKCV2965
MKCR0325
MKCV0366

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Visite la Librería de documentos

Maki Onoda et al.
Analytical sciences : the international journal of the Japan Society for Analytical Chemistry, 22(6), 815-817 (2006-06-15)
A simple batch method for the fluorometric determination of hydrogen peroxide using phosphine-based fluorescent reagents has been developed. A rapid, mild and selective derivatization reaction was achieved by adding sodium tungstate dihydrate to the reaction mixture of hydrogen peroxide and
Journal of the Chemical Society. Chemical Communications, 874-874 (1984)
Preparation of aqueous sols of tungsten oxide dihydrate from sodium tungstate by an ion-exchange method.
Choi YG, et al.
Sensors and Actuators B, Chemical, 87(1), 63-72 (2002)
Lattice constants and space group of sodium tungstate dihydrate.
Pistorius CWFT and Sharp WE.
Acta Crystallographica, 14(3), 316-317 (1961)
Reactions of hydrogen peroxide. IV. Sodium tungstate catalyzed epoxidation of α, β-unsaturated acids.
Payne GB and Williams PH.
The Journal of Organic Chemistry, 24(1), 54-55 (1959)
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Questions

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  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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