207802

Potassium dichromate

ACS reagent, ≥99.0%

• Synonym(s): Potassium bichromate
• Linear Formula: K₂Cr₂O₇
• CAS Number: 7778-50-9
• Molecular Weight: 294.18
• EC Number: 231-906-6
• MDL number: MFCD00011367
• UNSPSC Code: 12352302
• PubChem Substance ID: 329752023
• NACRES: NB.24

Properties

• grade: ACS reagent
• Assay: ≥99.0%
• form: crystals
• reaction suitability: reagent type: oxidant
• impurities: ≤0.005% insolubles
• loss: ≤0.05% loss on drying
• pH: 3.5-5.0 (25 °C, 29.4 g/L)
• mp: 398 °C (lit.)
• anion traces: chloride (Cl^-): ≤0.001%; sulfate (SO₄^2-): ≤0.005%
• cation traces: Ca: ≤0.003%; Na: ≤0.001%; Na: ≤0.02%; heavy metals (as Pb): ≤5 ppm
• SMILES string: [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O
• InChI: 1S/2Cr.2K.7O/q;;2*+1;;;;;;2*-1
• InChI key: KMUONIBRACKNSN-UHFFFAOYSA-N

Description

General description

Potassium dichromate is a red-orange colored solid. Its crystals belong to the triclinic crystal system. On heating above 600°C, it decomposes to give oxygen, potassium chromate and chromium(III) oxide. It acts as a strong oxidizing agent in acidic media. It can be synthesized by the fusion of chromium(III) oxide with potassium carbonate and nitrate or oxygen.

Application

Potassium dichromate may be used in the preparation of hybride polymer-clay nanocomposite supported dichromate reagents. It may also be used as an oxidant for the selective oxidation of primary and secondary alcohol to corresponding aldehydes and ketones, respectively.

Safety Information

• Pictograms: GHS03,GHS06,GHS08,GHS05,GHS09
• Signal Word: Danger
• Hazard Statements: H272,H301,H312,H314,H317,H330,H334,H335,H340,H350,H360FD,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 Inhalation - STOT SE 3
• Target Organs: Cardio-vascular system, Respiratory system
• Storage Class Code: 5.1B - Oxidizing hazardous materials
• WGK: WGK 3
• Flash Point(F): Not applicable
• Flash Point(C): Not applicable