Other names: potassium chromium sulfate; Chrome alum; Chrome alum; Potassium chrome alum; Potassium chromium (III) sulfate dodecahydrate; Black alum

CAS No.: 7788-99-0

CrK(SO4)2.12H2O=499.40

Grade: ar

Content: ≥ 99.5%

Heavy metals: ≤ 0.002%

Chloride: ≤ 0.002%

Ammonium salt: ≤ 0.01%

Water insoluble matter: ≤ 0.005%

Aluminum: ≤ 0.02%

Iron: ≤ 0.005%

 Physicochemical properties  (the following information is for reference only): purplish red to black octahedral cubic crystal. It is ruby red under transmitted light. Weathered in the air. 10 molecules of crystal water will be lost at 100 ℃, and all crystal water will be lost at 400 ℃. Soluble in 4 parts of cold water and 2 parts of boiling water, almost insoluble in ethanol. Its aqueous solution is purple when cold and green when hot. The relative density (D25) is 1.83. Melting point 89 ℃.

Usage: This product is only for scientific research, and cannot be used for other purposes. (the following uses are for reference only) analytical reagents. Fixative for microanalysis.

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