Description
Eriochrome black T is a classical metallochromic indicator supplied as a 1 % trituration in NaCl for laboratory water-hardness and complexometric determinations. The dye has the empirical formula C₂₀H₁₂N₃NaO₇S, a molar mass of 461,38 g/mol, CAS number 1787-61-7 and EG nr. 217-250-3. In this ready-to-use solid form the indicator is diluted in sodium chloride, which simplifies weighing and dosing for titration endpoints, particularly in the determination of calcium and magnesium hardness. Eriochrome black T from manufacturer Carl ROTH is widely applied in EDTA titrations and related complexometric assays where a sharp colour change marks the equivalence point. Physical-property and water-analysis workflows benefit from the defined 1 % indicator strength and the convenient trituration matrix. Handle according to standard laboratory practice for dye indicators; the associated safety documentation supports correct storage and use in analytical chemistry environments.
This article is part of Indicators & indicator solutions, in Analytical standards & reference materials.
Key features
- Suitability as indicator: complies
- CAS number: 1787-61-7
- Pack sizes: 50 g, 25 g, 100 g
- EG nr.: 217-250-3
- Empirical formula: C₂₀H₁₂N₃NaO₇S
- Molar mass: 461,38 g/mol
- Technical Information Sheet:
- Safety Data Sheet:
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Questions about Eriochrome black T, Indicator 1 % in NaCl, trituration, 50 g, plastic
What is this article?
Eriochrome black T, Indicator 1 % in NaCl, trituration, 50 g, plastic is the article on this page. Luminix Health distributes Carl Roth for laboratory use. It sits in Indicators & indicator solutions, inside Analytical standards & reference materials, in Lab chemicals.
An indicator solution changes colour at a stated point, usually a pH interval or a redox potential, so a titration endpoint can be seen. The solvent and the concentration decide how sharp the change is. A solid indicator dye and a ready solution are different articles.
A reference material is the article against which another result is compared. Its value is stated, and the uncertainty of that value is part of the product. An ICP or ion standard is a solution of known concentration. A volumetric standard is for titration. A chromatography standard is the peak you match. The grade names, including pharmacopoeia and ASTM, say which impurities were limited. Identity is checked on PubChem. Names follow IUPAC. Medicinal grades follow the European Pharmacopoeia and USP.
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The category is Analytical standards & reference materials. The sub-category is Indicators & indicator solutions. The catalogue is Lab chemicals.
Shelves beside this one are ICP, AAS & ion standards, Chromatography standards (GC, HPLC, pesticides), Reference substances & reagents (other), Volumetric standard solutions (titration), Reagents for analysis (Ph. Eur., ASTM, DIN) and Spectroscopy & physical property standards.
What should I check before I order?
The technical information on this page is the manufacturer's sheet. Read that, not a rewritten specification.
When this page shows a safety data sheet, use that manufacturer file. Hazard text does not belong in the sales description. For a pack size, a grade or a certificate that is not on the page, send a quote request or contact the team.
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