CAS number : 7788-99-0
Molecular weight :499.40
Molecular formula/chemical symbol :CrK(SO4)2.12H2O
Description :
Purple-red to black octahedral cubic crystal. Ruby red in transmitted light. Easily weathered. Ruby red in transmitted light, heated to 100 ? C lose some crystal water becomes green too dihydrate 110 ° C, 350 ℃ into anhydrous yellowish green and lose water-soluble. Soluble in water and dilute acids, insoluble in alcohol, can be dissolved in 4 parts of cold water, 2 parts boiling water, almost insoluble in alcohol. Its aqueous solution cold, purple, hot green.
USES :
Microscopic analysis with the fixing agent,
leather, preparation of other chromium salts.
Report :
TEST ITEMS |
TEST RESULT |
|
|
(AR) |
(CP) |
|
≥99.5 |
99.0 |
Water insoluble matter |
≤0.005 |
0.01 |
Chloride (Cl) |
≤0.002 |
0.005 |
Ammonium salts (NH4) (%) |
≤0.01 |
0.03 |
(AL) |
≤0.02 |
0.05 |
(Fe) |
≤0.005 |
0.02 |
Heavy metals (as Pb) |
≤0.002 |
0.01 |