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858390

Sigma-Aldrich

Eriochrome® Black T

ACS reagent (indicator grade)

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Synonym(s):
Mordant Black 11
Empirical Formula (Hill Notation):
C20H12N3NaO7S
CAS Number:
Molecular Weight:
461.38
Colour Index Number:
14645
Beilstein:
4121162
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NA.47

grade

ACS reagent (indicator grade)

Quality Level

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

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1 of 4

This Item
222461C1144P7884
Eriochrome® Black T ACS reagent (indicator grade)

Sigma-Aldrich

858390

Eriochrome® Black T

Murexide ACS reagent

Sigma-Aldrich

222461

Murexide

Chlorazol Black

Sigma-Aldrich

C1144

Chlorazol Black

Pyrocatechol Violet suitable for indicator

Sigma-Aldrich

P7884

Pyrocatechol Violet

form

powder

form

powder

form

powder

form

powder

technique(s)

titration: suitable

technique(s)

titration: suitable

technique(s)

-

technique(s)

titration: suitable

λmax

503 nm

λmax

525 nm

λmax

-

λmax

-

suitability

passes test for complexometric indicator

suitability

passes test for complexometric indicator

suitability

-

suitability

-

application(s)

diagnostic assay manufacturing
hematology
histology

application(s)

diagnostic assay manufacturing
hematology
histology

application(s)

diagnostic assay manufacturing
hematology
histology

application(s)

diagnostic assay manufacturing
hematology
histology

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

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

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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