207802

Potassium dichromate

ACS reagent, ≥99.0%

• Sinonimo/i: Potassium bichromate
• Formula condensata: K₂Cr₂O₇
• Numero CAS: 7778-50-9
• Peso molecolare: 294.18
• Numero CE: 231-906-6
• Numero MDL: MFCD00011367
• Codice UNSPSC: 12352302
• ID PubChem: 329752023
• NACRES: NB.24

Proprietà

• Grado: ACS reagent
• Livello qualitativo: 200
• Saggio: ≥99.0%
• Stato: crystals
• Impiego in reazioni chimiche: reagent type: oxidant
• Impurezze: ≤0.005% insolubles
• Perdita: ≤0.05% loss on drying
• pH: 3.5-5.0 (25 °C, 29.4 g/L)
• Punto di fusione: 398 °C (lit.)
• Anioni in tracce: chloride (Cl^-): ≤0.001%; sulfate (SO₄^2-): ≤0.005%
• Cationi in tracce: Ca: ≤0.003%; Na: ≤0.001%; Na: ≤0.02%; heavy metals (as Pb): ≤5 ppm
• Stringa SMILE: [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O
• InChI: 1S/2Cr.2K.7O/q;;2*+1;;;;;;2*-1; KMUONIBRACKNSN-UHFFFAOYSA-N

Descrizione

Descrizione generale

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.

Applicazioni

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.

Informazioni sulla sicurezza

• Pittogrammi: GHS03,GHS06,GHS08,GHS05,GHS09
• Avvertenze: Danger
• Indicazioni di pericolo: H272,H301,H312,H314,H317,H330,H334,H335,H340,H350,H360FD,H372,H410
• Consigli di prudenza: P210 - P260 - P280 - P303 + P361 + P353 - P304 + P340 + P310 - P305 + P351 + P338
• Classi di pericolo: 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
• Organi bersaglio: Cardio-vascular system, Respiratory system
• Codice della classe di stoccaggio: 5.1B - Oxidizing hazardous materials
• Classe di pericolosità dell'acqua (WGK): WGK 3
• Punto d’infiammabilità (°F): Not applicable
• Punto d’infiammabilità (°C): Not applicable