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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:
1787-61-7
Molecular Weight:
461.38
Colour Index Number:
14645
Beilstein:
4121162
EC Number:
217-250-3
MDL number:
MFCD00003935
UNSPSC Code:
12171500
PubChem Substance ID:
24888460
NACRES:
NA.47

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

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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
GHS07,GHS09

Signal Word

Warning

Hazard Statements

H319,H411

Hazard Classifications

Aquatic Chronic 2 - Eye Irrit. 2

WGK

WGK 2

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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