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sodium chromate in dye, tanned leather and chrome yellow pigment
sodium chromate basic information:
CAS: 7775-11-3
MF: Na2CrO4
Appearance: Yellow crystal
sodium chromate index:
|
Project Item |
industrial-grade |
|
(Na2CrO4·4H2O)% |
98.0 |
|
pH(50g/L solution,25℃) |
8.5~9.5 |
|
Water insolubles% |
0.01 |
|
Chloride % |
0.01 |
|
Sulfate (SO4) % |
0.05 |
|
K% |
0.05 |
|
Aluminum% |
0.01 |
|
Calcium% |
0.001 |
sodium chromate usage:
Oxidation, used in dye, tanned leather and chrome yellow pigment, etc. Antioxidant, mordant, rust inhibitor. The four six hydrate, hydrate, hydrate decahydrate. Industrial products for four hydrate, yellow slightly deliquescence crystallization. Heated to 68 ℃ lose crystal water be alpha anhydrous sodium chromate, type 413 ℃ into beta. Oxidation, easy for common reductant reduction for trivalent chromium.