Description
ACS reagent, ≥99.0%
Synonym: Potassium bichromate
Linear Formula: K2Cr2O7
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.
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 (SO42-): ≤0.005%
cation traces
Ca: ≤0.003%
Na: ≤0.001%
Na: ≤0.02%
heavy metals (as Pb): ≤5 ppm
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