| Molecular Formula: C14H7NaO7S•H2O |
| Molecular Weight: 360.27 |
| Properties: orange yellow or yellowish brown powder; easily soluble in water; slightly soluble in ethanol; insoluble in benzene and chloroform; PH of 1% water solution is 2.15. |
| Use: In the determination of fluoride; as acid-base indicator; in vital staining etc. |
| Storage and transport: Closed tight. |
| PH range |
4.0(yellow)-6.0(orange); 6.0(orange)-12.0(purple) |
| Acid-base sensitivity |
Qualified |
| Sensitivity to aluminum |
Qualified |
| Water solubility test |
Qualified |
| Residue on ignition(sulphates) |
≤25% |
| Organic impurities |
Qualified |
| Biological dyeing test |
Qualified |
