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4-(4-Nitrophenylazo)-resorcinol, p.a., Molar mass (M) 259,22 g/mol, CAS No. 74-39-5, EC No. 200-808-5, Empirical formula C12H9N3O4
| Determination of | Mg |
| Colour conversion | yellow - violet |
| Transition range pH | 11,0 - 13,0 |
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