Merck
All Photos(1)

1.03170

Supelco

Eriochrome black T (C.I. 14645)

indicator for complexometry 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:
Molecular Weight:
461.38
MDL number:
EC Index Number:
217-250-3

Quality Level

grade

ACS reagent

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

Looking for similar products? Visit Product Comparison Guide

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 λmax. (buffer pH 10.0): 612 - 616 nm
Spec. Absorptivity A 1%/1cm (λmax; 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

Pictograms

Exclamation markEnvironment

Signal Word

Warning

Hazard Statements

Hazard Classifications

Aquatic Chronic 2 - Eye Irrit. 2

Storage Class Code

11 - Combustible Solids

WGK

WGK 2

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificate of Analysis

Enter Lot Number to search for Certificate of Analysis (COA).

Certificate of Quality

Enter Lot Number to search for Certificate of Quality (COQ).

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

Contact Technical Service