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Merck
CN

858390

Eriochrome® Black T

ACS reagent (indicator grade)

Synonym(s):

Mordant Black 11

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About This Item

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

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Product Name

Eriochrome® Black T, ACS reagent (indicator grade)

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

SMILES string

[Na+].Oc1cc(c2cc(ccc2c1\N=N\c3ccc4ccccc4c3O)[N+]([O-])=O)S([O-])(=O)=O

grade

ACS reagent (indicator grade)

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

Quality Level

200

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Application

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

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.

Legal Information

Eriochrome is a registered trademark of Huntsman Petrochemical, LLC

pictograms

Exclamation markEnvironment
GHS07,GHS09

signalword

Warning

hcodes

H319,H411

Hazard Classifications

Aquatic Chronic 2 - Eye Irrit. 2

Storage Class

11 - Combustible Solids

wgk

WGK 2

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

Eyeshields, Gloves, type N95 (US)

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Certificates of Analysis (COA)

Lot/Batch Number
0000490890
0000490890
SHBT0915
SHBS7011
0000368223

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Laboratory Manual for Principles of General Chemistry (2010)
Chemistry for engineers (2008)
Physical Chemistry for the JEE and Other Engineering Entrance Examinations (2013)
CRC Handbook of Organic Analytical Reagents (2017)
A Text Book Of Chemistry Practicals (2 Vols) (1995)
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