S P E C I F I C A T I O N S

ERIOCHROME BLACK T ACS

Synonyms:					3-Hydroxy-4-[(1-hydroxy-2-naphthalenyl)
azo]-7-nitro-1-naphthalenesulfonic Acid,
Monosodium Salt; Mordant Black 11						
CAS No:					1787-61-7

Chemical Formula:				C20H12N3NaO7S

Formula Weight:				461.38

Appearance:					Black powder

Loss on drying:				< 7%

Absorptivity 1%/1cm			>320
(At pH 10 Ammonia Buffer +
2ml 0.05 E.D.T.A. Solution)
at λ max. 623.5 nm

Clarity of Solution:				To pass test

Suitability as Complexometric 		To pass test
 Indicator:					

Effective: 01/16/17