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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:
12352302
eCl@ss:
38180716
PubChem Substance ID:
329755966
NACRES:
NB.24

grade

ACS reagent

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

Regulatory Listings

Regulatory Listings are mainly provided for chemical products. Only limited information can be provided here for non-chemical products. No entry means none of the components are listed. It is the user’s obligation to ensure the safe and legal use of the product.

EU REACH SVHC Candidate List

CAS No.

EU REACH Annex XVII (Restriction List)

CAS No.

EU REACH Annex XIV (Authorisation List)

CAS No.

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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Voltammetry of chromium (VI) at the liquid| liquid interface.
O'Mahony AM, et al.
Electrochemical Communications, 7(10), 976-982 (2005)
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)
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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