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Ammonium dichromate

Name: Ammonium dichromate
Brand: SIGALD

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

PubChem Substance ID:

329755966

eCl@ss:

38180716

UNSPSC Code:

12352302

NACRES:

NB.24

EC Number:

232-143-1

MDL number:

MFCD00010879

Assay:

≥99.5%

Grade:

ACS reagent

Form:

crystals

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Properties

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 (SO₄^2-): ≤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

Description

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.

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pictograms

GHS03,GHS06,GHS08,GHS05,GHS09

signalword

Danger

hcodes

H272,H301,H312,H314,H317,H330,H334,H340,H350,H360,H372,H410

pcodes

P210 - P260 - P280 - P303 + P361 + P353 - P304 + P340 + P310 - P305 + P351 + P338

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

4.1A - Other explosive hazardous materials

wgk

WGK 3

flash_point_f

Not applicable

flash_point_c

Not applicable

Regulatory Information

易制爆化学品

危险化学品

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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)

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)

Oxidative coupling of thiols in solution and under solvent-free conditions.