Skip to Content
Merck
All Photos(3)

Key Documents

View All Documentation

207802

Sigma-Aldrich

Potassium dichromate

ACS reagent, ≥99.0%

Synonym(s):

Potassium bichromate

Sign Into View Organizational & Contract Pricing

Select a Size

100 G
$159.00
500 G
$230.00

$159.00

Estimated to ship onMarch 29, 2025

Request a Bulk Order
All Photos(3)

Select a Size

Change View
100 G
$159.00
500 G
$230.00

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

$159.00

Estimated to ship onMarch 29, 2025

Request a Bulk Order

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

Looking for similar products? Visit Product Comparison Guide

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.[1]

Application

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]

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

Choose from one of the most recent versions:

Certificates of Analysis (COA)

Lot/Batch Number
MKCW0639
MKCV6315
MKCW6784
MKCT4740
MKCS3074

Don't see the Right Version?

If you require a particular version, you can look up a specific certificate by the Lot or Batch number.

Search for a COA

Already Own This Product?

Find documentation for the products that you have recently purchased in the Document Library.

Visit the Document Library

Customers Also Viewed

Slide 1 of 2

1 of 2

Silver sulfate puriss. p.a., ACS reagent, ≥99.5%

Sigma-Aldrich

31494

Silver sulfate

Sodium dichromate dihydrate ACS reagent, ≥99.5%

Sigma-Aldrich

398063

Sodium dichromate dihydrate

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
View All Related Papers

Questions

1–2 of 2 Questions  

  1. 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

      Helpful?

  2. 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

      Helpful?

Reviews

No rating value

Active Filters

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

Contact Technical Service