402826

Ammonium dichromate

ACS reagent, ≥99.5%

• Synonym(s): Ammonium bichromate
• 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

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.

Safety Information

• Pictograms: GHS03,GHS06,GHS08,GHS05,GHS09
• Signal Word: Danger
• Hazard Statements: H272,H301,H312,H314,H317,H330,H334,H340,H350,H360,H372,H410
• Precautionary Statements: 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 Code: 4.1A - Other explosive hazardous materials
• WGK: WGK 3
• Flash Point(F): Not applicable
• Flash Point(C): Not applicable