Skip to Content
Merck
All Photos(2)

Documents

402826

Sigma-Aldrich

Ammonium dichromate

ACS reagent, ≥99.5%

Synonym(s):

Ammonium bichromate

Sign Into View Organizational & Contract Pricing
All Photos(2)

About This Item

Linear Formula:
(NH4)2Cr2O7
CAS Number:
7789-09-5
Molecular Weight:
252.06
EC Number:
232-143-1
MDL number:
MFCD00010879
UNSPSC Code:
12352302
eCl@ss:
38180716
PubChem Substance ID:
329755966
NACRES:
NB.24

grade

ACS reagent

Quality Level

200

vapor density

8.7 (vs air)

Assay

≥99.5%

form

crystals

reaction suitability

reagent type: oxidant

impurities

≤0.005% insolubles

loss

≤3.0% loss on drying

pH

3-4 (25 °C, 50 g/L)

mp

170 °C (dec.) (lit.)

anion traces

chloride (Cl-): ≤0.005%
sulfate (SO42-): ≤0.01%

cation traces

Ca: ≤0.002%
Fe: ≤0.002%
Na: ≤0.005%

SMILES string

N.N.O[Cr](=O)(=O)O[Cr](O)(=O)=O

InChI

1S/2Cr.2H3N.2H2O.5O/h;;2*1H3;2*1H2;;;;;/q2*+1;;;;;;;;;/p-2

InChI key

XAQCJVGGJJFLPP-UHFFFAOYSA-L

Looking for similar products? Visit Product Comparison Guide

General description

Ammonium dichromate is a hexavalent chromium compound with a high oxidation potential. Hexavalent chromium is potent carcinogen and an environmental pollutant.

Application

Ammonium dichromate may be used in the following processes:
  • Oxidation of alcohols in the presence of Mg(HSO4)2 (magnesium hydrogen sulfate) and wet SiO2 (silicon dixide).
  • Preparation of Cr2O3/Al2O3 (chromium (III) oxide/aluminium oxide) catalysts.
  • Oxidative coupling of thiols.
  • Preparation of mesoporous molecular sieves.
  • Preparation of polypyrrole (PPy).
  • Preparation of solid oxide fuel cell (SOFC) interconnect.

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

Storage Class Code

4.1A - Other explosive hazardous materials

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

Already Own This Product?

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

Visit the Document Library

Voltammetry of chromium (VI) at the liquid| liquid interface.
O'Mahony AM, et al.
Electrochemical Communications, 7(10), 976-982 (2005)
Oxidative coupling of thiols in solution and under solvent-free conditions.
Shirini F, et al.
Mendeleev Communications, 14(1), 34-35 (2004)
Oxidative dehydrogenation of propane over Cr2O3/Al2O3 and Cr2O3 catalysts: effects of loading, precursor and surface area.
Cherian M, et al.
Applied Catalysis A: General, 233(1), 21-33 (2002)
Oxidation of Alcohols by (NH4)2Cr2O7 in Solution and Under Solvent-Free Conditions.
Shirini F, et al.
Australian Journal of Chemistry, 54(6), 405-406 (2001)
Hexavalent chromium (VI): Environment pollutant and health hazard.
Das AP and Mishra S.
Journal of Environmental Research And Development, 2(3), 386-392 (2008)
View All Related Papers

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