207802

Potassium dichromate

ACS reagent, ≥99.0%

• Synonyme(s) : Potassium bichromate
• Formule linéaire : K₂Cr₂O₇
• Numéro CAS: 7778-50-9
• Poids moléculaire : 294.18
• Numéro CE : 231-906-6
• Numéro MDL: MFCD00011367
• Code UNSPSC : 12352302
• ID de substance PubChem : 329752023
• Nomenclature NACRES : NB.24

Propriétés

• Qualité: ACS reagent
• Pureté: ≥99.0%
• Forme: crystals
• Pertinence de la réaction: reagent type: oxidant
• Impuretés: ≤0.005% insolubles
• Perte: ≤0.05% loss on drying
• pH: 3.5-5.0 (25 °C, 29.4 g/L)
• Pf: 398 °C (lit.)
• Traces d'anions: chloride (Cl^-): ≤0.001%; sulfate (SO₄^2-): ≤0.005%
• Traces de cations: Ca: ≤0.003%; Na: ≤0.001%; Na: ≤0.02%; heavy metals (as Pb): ≤5 ppm
• Chaîne SMILES: [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O
• InChI: 1S/2Cr.2K.7O/q;;2*+1;;;;;;2*-1
• Clé InChI: KMUONIBRACKNSN-UHFFFAOYSA-N

Description

Description générale

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.

Informations sur la sécurité

• Pictogrammes: GHS03,GHS06,GHS08,GHS05,GHS09
• Mention d'avertissement: Danger
• Mentions de danger: H272,H301,H312,H314,H317,H330,H334,H335,H340,H350,H360FD,H372,H410
• Conseils de prudence: P210 - P260 - P280 - P303 + P361 + P353 - P304 + P340 + P310 - P305 + P351 + P338
• Classification des risques: 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
• Organes cibles: Cardio-vascular system, Respiratory system
• Code de la classe de stockage: 5.1B - Oxidizing hazardous materials
• Classe de danger pour l'eau (WGK): WGK 3
• Point d'éclair (°F): Not applicable
• Point d'éclair (°C): Not applicable