1.03170

Eriochrome black T (C.I. 14645)

metal indicator, ACS, Reag. Ph Eur

• Synonym(s): Eriochrome black T (C.I. 14645), Chrome black T, 2-Hydroxy-1-(1-hydroxy-2-naphthylazo)-6-nitronaphthalene-4-sulfonic acid sodium salt
• Empirical Formula (Hill Notation): C₂₀H₁₂N₃NaO₇S
• CAS Number: 1787-61-7
• Molecular Weight: 461.38
• MDL number: MFCD00003935
• UNSPSC Code: 12352107
• EC Index Number: 217-250-3
• NACRES: NB.21

Properties

• product name: Eriochrome black T (C.I. 14645), indicator for complexometry ACS,Reag. Ph Eur
• grade: ACS reagent
• Quality Level: 200
• agency: reag. Ph. Eur.
• form: powder
• potency: 17590 mg/kg LD₅₀, oral (Rat)
• loss: ≤7% loss on drying, 110°C
• color: black to dark brown
• pH: 3.7 (20 °C, 10 g/L in H₂O)
• solubility: 50 g/L
• bulk density: 400‑600 kg/m³
• λmax: 612-616 nm (buffer pH 10.0)
• storage temp.: 15-25°C
• 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;/h1-10,21,25H,(H,28,29,30);/q;+1/p-1/b22-19-;
• InChI key: JHUJLRKQZAPSDP-GXTSIBQPSA-M

Description

Linkage

Replaces: EX0100-5; EX0100

Analysis Note

Identity (UV/VIS-Spectrum): passes test
Appearance: Black to dark brown-black fine powder, eventually with granular parts
Clarity of solution: passes test
Absorption maximum λ_max. (buffer pH 10.0): 612 - 616 nm
Spec. Absorptivity A 1%/1cm (λ_max; 0.02 g/l; buffer pH 10.0; calc. on dried substance): 400 - 510
Loss on drying (110 °C): ≤ 7 %
Suitability as indicator (for complexometric titration, ACS): passes test
Suitability as indicator (Reag. Ph Eur): passes test

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