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398063

Sigma-Aldrich

Sodium dichromate dihydrate

ACS reagent, ≥99.5%

Sinônimo(s):

Sodium bichromate

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About This Item

Fórmula linear:
Na2Cr2O7 · 2H2O
Número CAS:
7789-12-0
Peso molecular:
298.00
Número CE:
234-190-3
Número MDL:
MFCD00149166
Código UNSPSC:
12352302
ID de substância PubChem:
329755905
NACRES:
NA.21
Preço e disponibilidade não estão disponíveis no momento.

grau

ACS reagent

Nível de qualidade

200

Ensaio

≥99.5%

Formulário

crystals

adequação da reação

reagent type: oxidant

Impurezas

≤0.005% NH4OH ppt.
≤0.005% insolubles

pH

3.5 (20 °C, 100 g/L)

pf

91 °C (lit.)

traços de ânion

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

traços de cátion

Al: ≤0.002%
Ca: ≤0.003%

cadeia de caracteres SMILES

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

InChI

1S/2Cr.2Na.2H2O.7O/h;;;;2*1H2;;;;;;;/q;;2*+1;;;;;;;;2*-1

chave InChI

JYDRNIYTFCBIFC-UHFFFAOYSA-N

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Descrição geral

Sodium dichromate dehydrate (SDD), a hexavalent chromium compound[1] is commonly used as an oxidizing agent.[2] Chromium (VI) compounds are genotoxic and group 1 IARC (International Agency for Research on Cancer) carcinogen.[3] SDD is one of the common contaminants found in drinking water. Its toxic effects and carcinogenicity has been studied.[1][3][4][5]

Aplicação

Sodium dichromate dehydrate may be used in preparing Jones reagent which is employed for oxidation reactions.[6] It may be used in the oxidation of arylalkanes.[7]

Palavra indicadora

Danger

Classificações de perigo

Acute Tox. 2 Inhalation - Acute Tox. 3 Oral - Acute Tox. 4 Dermal - Aquatic Acute 1 - Aquatic Chronic 1 - Carc. 1B - Eye Dam. 1 - Muta. 1B - Ox. Sol. 2 - Repr. 1B - Resp. Sens. 1 - Skin Corr. 1B - Skin Sens. 1 - STOT RE 1 Inhalation

Código de classe de armazenamento

5.1B - Oxidizing hazardous materials

Classe de risco de água (WGK)

WGK 3

Ponto de fulgor (°F)

Not applicable

Ponto de fulgor (°C)

Not applicable

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Certificados de análise (COA)

Lot/Batch Number
MKCW6057
MKCV5979
MKCT0564
MKCV2908
MKCR9211

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  1. 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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  2. 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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