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Eriochrome Black T CAS 1787-61-7
Sudan IV CAS 85-83-6
21/12/2018
Bromocresol Purple CAS 115-40-2
21/12/2018
| Model: | MOS 1787-61-7 |
| Brand Name: | MOSINTER |
| CAS No.: | 1787-61-7 |
| Molecular formula: | C20H12N3NaO7S |
| Molecular weight: | 461.38 |
| Density: | 1.109 g/mL at 25 °C |
| Storage condition: | Store at RT. |
| Colour index (CI): | 14645 |
| Soluble: | 50 g/L (20 ºC) |
| Flashing point: | 185 °C |
| Sensibility: | Stable. Incompatible with strong oxidizing agents, strong reducing agents. |
Eriochrome Black T (CAS: 1787-61-7)
| Item | Index |
| Appearance | Dark brown powder |
| Density (g/ml) | 1.109 |
| Water solubility (g/l) | 50 |
| Flash point ℃ | 185 |
Eriochrome Black T is a complexometric indicator that is part of the complexometric titrations, e.g.
in the water hardness determination process. It is an azo dye. Eriochrome is a trademark of Ciba-Geigy.
In its protonated form, Eriochrome Black T is blue. It turns red when it forms a complex with calcium,
magnesium, or other metal ions.
Applications
When used as an indicator in an EDTA titration, the characteristic blue end-point is reached when
sufficient EDTA is added and the metal ions arechelated by EDTA, leaving the free indicator molecule.
Eriochrome Black T has also been used to detect the presence of rare earth metals.
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