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207802

Sigma-Aldrich

Potassium dichromate

ACS reagent, ≥99.0%

Sinônimo(s):

Potassium bichromate

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100 G
R$ 641,00
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R$ 919,00

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Disponível para enviar em14 de abril de 2025Detalhes

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R$ 641,00
500 G
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About This Item

Fórmula linear:
K2Cr2O7
Número CAS:
7778-50-9
Peso molecular:
294.18
Número CE:
231-906-6
Número MDL:
MFCD00011367
Código UNSPSC:
12352302
ID de substância PubChem:
329752023
NACRES:
NB.24

R$ 641,00

Disponível para enviar em14 de abril de 2025Detalhes

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grau

ACS reagent

Nível de qualidade

200

Ensaio

≥99.0%

Formulário

crystals

adequação da reação

reagent type: oxidant

Impurezas

≤0.005% insolubles

perda

≤0.05% loss on drying

pH

3.5-5.0 (25 °C, 29.4 g/L)

pf

398 °C (lit.)

traços de ânion

chloride (Cl-): ≤0.001%
sulfate (SO42-): ≤0.005%

traços de cátion

Ca: ≤0.003%
Na: ≤0.001%
Na: ≤0.02%
heavy metals (as Pb): ≤5 ppm

cadeia de caracteres SMILES

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

InChI

1S/2Cr.2K.7O/q;;2*+1;;;;;;2*-1

chave InChI

KMUONIBRACKNSN-UHFFFAOYSA-N

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Descrição geral

Potassium dichromate is a red-orange colored solid. Its crystals belong to the triclinic crystal system. On heating above 600°C, it decomposes to give oxygen, potassium chromate and chromium(III) oxide. It acts as a strong oxidizing agent in acidic media. It can be synthesized by the fusion of chromium(III) oxide with potassium carbonate and nitrate or oxygen.[1]

Aplicação

Potassium dichromate may be used in the preparation of hybride polymer-clay nanocomposite supported dichromate reagents.[2] It may also be used as an oxidant for the selective oxidation of primary and secondary alcohol to corresponding aldehydes and ketones, respectively.[3]

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 - STOT SE 3

Órgãos-alvo

Cardio-vascular system, Respiratory system

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

Escolha uma das versões mais recentes:

Certificados de análise (COA)

Lot/Batch Number
MKCW0639
MKCV6315
MKCW6784
MKCT4740
MKCS3074

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Synthesis and application of polymer-clay nanocomposite-supported dichromate oxidizing agent.
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Questions

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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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