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About This Item
Empirical Formula (Hill Notation):
C20H12N3NaO7S
CAS Number:
Molecular Weight:
461.38
EC Number:
217-250-3
UNSPSC Code:
12171500
NACRES:
NA.47
PubChem Substance ID:
MDL number:
Colour Index Number:
14645
Beilstein/REAXYS Number:
4121162
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
General description
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.
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.
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
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signalword
Warning
hcodes
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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Chemistry for engineers (2008)
Laboratory Manual for Principles of General Chemistry (2010)
Physical Chemistry for the JEE and Other Engineering Entrance Examinations (2013)
Global Trade Item Number
| SKU | GTIN |
|---|---|
| 858390-500G | 04061833032381 |
| 858390-100G | 04061835570829 |
| 858390-1KG | 04061826759806 |

