Compound Q&A
What is Eriochrome black T indicator (CAS: 1787-61-7)?
Answer
Eriochrome black T indicator (C.I. 14645), 1% solid, is a metal ion indicator used in analytical chemistry. Its chemical formula is C20H12N2Na2O8S2. It appears as a deep blue powder and is soluble in water, commonly employed for detecting calcium and magnesium ions in solution due to its color change properties in pH ranges 9–11.
About
CAS No
1787-61-7
English Name
Eriochrome black T indicator (C.I. 14645), 1% solid
Molecular Formula
C20H12N3NaO7S
Molecular Weight
461.4 g/mol
SMILES
C1=CC=C2C(=C1)C=CC(=C2O)N=NC3=C4C=CC(=CC4=C(C=C3O)S(=O)(=O)[O-])[N+](=O)[O-].[Na+]
InChIKey
AMMWFYKTZVIRFN-UHFFFAOYSA-M
Last Updated: 2025-08-25 01:09
