| Molecular Formula: C21H14Br4O5S |
| Molecular Weight: 698.02 |
| Properties: light yellow crystal or brown powder; soluble in ethanol, insoluble in water. |
| Use: acid-base indicator. |
| PH range |
3.8(yellowish green)-5.4(blue) |
| Ethanol solubility test |
Qualified |
| Drying loss |
≤3.0% |
| Residue on ignition(sulphates) |
≤0.25% |
| Maximum Absorption Wavelength, nm: |
| λ1(PH3.8) |
440-445 |
| λ2(PH5.4) |
615-618 |
| Mass absorption eoefficient, L/(cm,g): |
| a1(λ1, PH3.8, dry sample) |
24-28 |
| a2(λ2, PH5.4, dry sample) |
53-58 |
