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207802

Sigma-Aldrich

Potassium dichromate

ACS reagent, ≥99.0%

Synonym(s):

Potassium bichromate

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About This Item

Linear Formula:
K2Cr2O7
CAS Number:
7778-50-9
Molecular Weight:
294.18
EC Number:
231-906-6
MDL number:
MFCD00011367
UNSPSC Code:
12352302
PubChem Substance ID:
329752023
NACRES:
NB.24
Assay:
≥99.0%
grade:
ACS reagent
form:
crystals

grade

ACS reagent

Quality Level

200

Assay

≥99.0%

form

crystals

reaction suitability

reagent type: oxidant

impurities

≤0.005% insolubles

loss

≤0.05% loss on drying

pH

3.5-5.0 (25 °C, 29.4 g/L)

mp

398 °C (lit.)

anion traces

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

cation traces

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

SMILES string

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

InChI

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

InChI key

KMUONIBRACKNSN-UHFFFAOYSA-N

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General description

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.

Application

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

Signal Word

Danger

Hazard Classifications

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

Target Organs

Cardio-vascular system, Respiratory system

Storage Class Code

5.1B - Oxidizing hazardous materials

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Regulatory Listings

Regulatory Listings are mainly provided for chemical products. Only limited information can be provided here for non-chemical products. No entry means none of the components are listed. It is the user’s obligation to ensure the safe and legal use of the product.

PDSCL

Deleterious substance

PRTR

Specified Class I Designated Chemical Substances

FSL

Group 1: Oxidizing solids
Dichromates
Hazardous rank III
3rd oxidizing solid

ISHL Indicated Name

Substances Subject to be Indicated Names

ISHL Notified Names

Substances Subject to be Notified Names

JAN Code

207802-2.5KG:4548173250588
207802-4X2.5KG:4548173250595
207802-500G:4548173114811
207802-VAR:
207802-100G:4548173114804
207802-5G:4548173250601
207802-6X500G:4548173114828
207802-BULK:

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Certificates of Analysis (COA)

Lot/Batch Number
MKCW0639
MKCV6315
MKCW6784
MKCT4740
MKCS3074

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Selective solvent-free oxidation of alcohols with potassium dichromate
Lou J-D and Xu Z-N
Tetrahedron Letters, 43(49), 8843-8844 (2002)
Synthesis and application of polymer-clay nanocomposite-supported dichromate oxidizing agent.
El-Hamshary H, et al.
Polymer Composites, 36(11), 2066-2075 (2015)
Nicholas James Strausfeld et al.
eLife, 9 (2020-03-04)
Descriptions of crustacean brains have focused mainly on three highly derived lineages of malacostracans: the reptantian infraorders represented by spiny lobsters, lobsters, and crayfish. Those descriptions advocate the view that dome- or cap-like neuropils, referred to as 'hemiellipsoid bodies,' are
Marcel E Sayre et al.
The Journal of comparative neurology, 527(14), 2371-2387 (2019-03-13)
Paired centers in the forebrain of insects, called the mushroom bodies, have become the most investigated brain region of any invertebrate due to novel genetic strategies that relate unique morphological attributes of these centers to their functional roles in learning
Bruno Pinto et al.
Neuron, 108(5), 887-904 (2020-10-08)
Microglia are brain-resident immune cells and regulate mechanisms essential for cognitive functions. Down syndrome (DS), the most frequent cause of genetic intellectual disability, is caused by a supernumerary chromosome 21, containing also genes related to the immune system. In the
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