858390

Eriochrome^® Black T

ACS reagent (indicator grade)

• Synonym(s): Mordant Black 11
• Empirical Formula (Hill Notation): C₂₀H₁₂N₃NaO₇S
• CAS Number: 1787-61-7
• Molecular Weight: 461.38
• Colour Index Number: 14645
• Beilstein/REAXYS Number: 4121162
• EC Number: 217-250-3
• MDL number: MFCD00003935
• UNSPSC Code: 12171500
• PubChem Substance ID: 24888460
• NACRES: NA.47

Properties

• grade: ACS reagent (indicator grade)
• Quality Level: 200
• form: powder
• clarity of soln: passes test
• technique(s): titration: suitable
• λmax: 503 nm
• suitability: passes test for complexometric indicator
• application(s): diagnostic assay manufacturing; hematology; histology
• storage temp.: room temp
• SMILES string: [Na+].Oc1cc(c2cc(ccc2c1\N=N\c3ccc4ccccc4c3O)[N+]([O-])=O)S([O-])(=O)=O
• InChI: 1S/C20H13N3O7S.Na/c24-17-10-18(31(28,29)30)15-9-12(23(26)27)6-7-14(15)19(17)22-21-16-8-5-11-3-1-2-4-13(11)20(16)25;/h1-10,24-25H,(H,28,29,30);/q;+1/p-1/b22-21+;
• InChI key: AMMWFYKTZVIRFN-QUABFQRHSA-M

Description

General description

Eriochrome^® Black T is a hydroxyl-arylazo dye and is generally supplied as a monosodium salt. This dye exists as a dark violet powder with green metallic sheen. Eriochrome Black T is soluble in water and alcohol, but insoluble in common organic solvents. It is mainly used as an indicator in ethylenediaminetetraacetic acid (EDTA) method to determine hardness of water.

Eriochrome^® Black T is used as an indicator for complexometric titrations. It functions as an acid-base indicator. Eriochrome^® Black T forms complex with Ca²⁺ and Mg²⁺, but it binds more strongly to Mg²⁺ ions.

Application

Eriochrome^® Black T has been used to determine the concentration of Ca²⁺ using complexometric titration method.

Legal Information

Eriochrome is a registered trademark of Huntsman Petrochemical, LLC

Safety Information

• pictograms: GHS07,GHS09
• signalword: Warning
• hcodes: H319 - H411
• pcodes: P264 - P273 - P280 - P305 + P351 + P338 - P337 + P313 - P391
• Hazard Classifications: Aquatic Chronic 2 - Eye Irrit. 2
• Storage Class: 11 - Combustible Solids
• wgk_germany: WGK 2
• flash_point_f: Not applicable
• flash_point_c: Not applicable
• ppe: Eyeshields, Gloves, type N95 (US)