Congo red(indicator)
| Molecular Formula: C32H22N6Na2O6S2 |
| Molecular Weight: 696.68 |
| Properties: brownish red powder; soluble in water and alcohols; slightly soluble in acetone; almost insoluble in aethers; max. absorbance(PH7.3, 488nm, 1%1cm)595. |
| Use: As acid-base indicator, absorption indicator; or in the determination of boric acid, cyanide and Hcl. |
| Storage: Closed tight. |
| Transparency of solution |
Qualified |
| PH range |
3.0(violet)-5.2(red) |
| Water insolubles |
≤1% |
| Residue on ignition(sulphates) |
≤27% |
| Water Content |
≤5% |
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