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402826

Sigma-Aldrich

Ammonium dichromate

ACS reagent, ≥99.5%

Synonym(s):

Ammonium bichromate

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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:
12352300
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

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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’.

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Synthesis, characterization and catalytic application of Cr-SBA-1 mesoporous molecular sieves.
Zhao X and Wang X.
J. Mol. Catal. A: Chem., 261(2), 225-231 (2007)
Synthesis of La 0.7Ca0.3CrO3 SOFC interconnect using a chromium source.
Ghosh S, et al.
Electrochemical and Solid-State Letters, 9(11), A516-A519 (2006)
Voltammetry of chromium (VI) at the liquid| liquid interface.
O'Mahony AM, et al.
Electrochemical Communications, 7(10), 976-982 (2005)
Polypyrrole as a protective pigment in organic coatings
Selvaraj M, et al.
Synthetic Metals, 158(21), 888-899 (2008)
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)
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