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Merck
CN

207802

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
NACRES:
NB.24
PubChem Substance ID:
329752023
UNSPSC Code:
12352302
EC Number:
231-906-6
MDL number:
MFCD00011367
Assay:
≥99.0%
Grade:
ACS reagent
Form:
crystals
Solubility:
water: soluble (ca.29.4 g/l at 20 °C (68 °F))

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Product Name

Potassium dichromate, ACS reagent, ≥99.0%

InChI

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

InChI key

KMUONIBRACKNSN-UHFFFAOYSA-N

SMILES string

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

grade

ACS reagent

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.)

solubility

water: soluble (ca.29.4 g/l at 20 °C (68 °F))

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

Quality Level

200

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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.

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.

signalword

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

5.1B - Oxidizing hazardous materials

wgk

WGK 3

flash_point_f

Not applicable

flash_point_c

Not applicable

Regulatory Information

危险化学品
易制爆化学品
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Certificates of Analysis (COA)

Lot/Batch Number
MKCX8985
MKCX7019
MKCW0639
MKCV6315
MKCW6784

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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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