Eriochrome Black T
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| Abbreviations | EBT |
| Template:Longitem | 4121162 |
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| MeSH | Eriochrome+black+T |
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| UN number | 2923 |
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| Template:Longitem | C20H12N3O7SNa |
| Molar mass | 461.381 g/mol |
| Appearance | dark red/brown powder |
| Acidity (pKa) | 6.2, 11.55 |
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Eriochrome Black T is a complexometric indicator that is used in complexometric titrations, e.g. in the water hardness determination process. It is an azo dye. Eriochrome is a trademark of Huntsman Petrochemical, LLC.[1]
In its deprotonated 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 bound to the indicator are chelated by EDTA, leaving the free indicator molecule.
Eriochrome Black T has also been used to detect the presence of rare earth metals.[2]
References
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External links
- J.T. Baker MSDSTemplate:Category handler[<span title="Script error: No such module "string".">usurped]Script error: No such module "Check for unknown parameters".
- Describes a procedure for determining the hardness of water using EDTA with Eriochrome indicator