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207802

Sigma-Aldrich

Potassium dichromate

ACS reagent, ≥99.0%

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Synonym(s):
Potassium bichromate
Linear Formula:
K2Cr2O7
CAS Number:
Molecular Weight:
294.18
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NB.24

grade

ACS reagent

Quality Level

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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1 of 4

This Item
P5271420191.02403
vibrant-m

207802

Potassium dichromate

Essential Grade
vibrant-m

P5271

Potassium dichromate

-
vibrant-m

42019

Potassium dichromate

-
vibrant-m

1.02403

Potassium dichromate

-
assay

≥99.0%

assay

≥99.5%

assay

≥99.5%

assay

-

Quality Level

200

Quality Level

200

Quality Level

100

Quality Level

300

grade

ACS reagent

grade

-

grade

reference material

grade

-

mp

398 °C (lit.)

mp

398 °C (lit.)

mp

398 °C (lit.)

mp

398 °C

pH

3.5-5.0 (25 °C, 29.4 g/L)

pH

3.6 (100 g/L)

pH

-

pH

3.6 (100 g/L in H2O)

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.

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 - STOT RE 1 Inhalation - STOT SE 3

target_organs

Cardio-vascular system, Respiratory system

Storage Class

5.1B - Oxidizing hazardous materials

wgk_germany

WGK 3

flash_point_f

Not applicable

flash_point_c

Not applicable


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