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Chromium trioxide is generated by treating sodium dichromate with sulfuric acid: [6]. H 2 SO 4 + Na 2 Cr 2 O 7 → 2 CrO 3 + Na 2 SO 4 + H 2 O. Approximately 100,000 tonnes are produced annually by this or similar routes.
Molar mass: 151.9904 g/mol Appearance light to dark green, fine crystals Density: 5.22 g/cm 3: Melting point: 2,435 °C (4,415 °F; 2,708 K) Boiling point:
H 2 CrO 4 (chromic acid) H 2 Cr 2 O 7 (dichromic acid) : Molar mass: 118.008 g/mol (chromic acid) 218.001 g/mol (dichromic acid) Appearance Dark purplish-red sand-like crystalline solid or powder [clarification needed]
Molar mass: 459.6808 g/mol Appearance yellow powder Solubility in water. reacts, see also solubility chart: Hazards Occupational safety and health (OHS/OSH):
Molar mass: 349.32 Appearance deep maroon Density: 1.34 g/cm 3: Melting point: 210 °C (410 °F; 483 K) Boiling point: 340 °C (644 °F; 613 K) (sublimes near 110°C) [2] Solubility in non-polar organic solvents soluble Hazards GHS labelling:
Chromium(II) oxide (CrO) is an inorganic compound composed of chromium and oxygen. [1] It is a black powder that crystallises in the rock salt structure. [2] Hypophosphites may reduce chromium(III) oxide to chromium(II) oxide:
Pyridinium chlorochromate in a vial. Pyridinium chlorochromate (PCC) is a yellow-orange salt with the formula [C 5 H 5 NH] + [CrO 3 Cl] −.It is a reagent in organic synthesis used primarily for oxidation of alcohols to form carbonyls.
CrO 2 was first prepared by Friedrich Wöhler by decomposition of chromyl chloride. Acicular chromium dioxide was first synthesized in 1956 by Norman L. Cox, a chemist at E.I. DuPont, by decomposing chromium trioxide in the presence of water at a temperature of 800 K (527 °C; 980 °F) and a pressure of 200 MPa.