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CAS 1787-61-7

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Eriochrome Black T

Description:
Eriochrome Black T, with the CAS number 1787-61-7, is a synthetic organic compound commonly used as a pH indicator and a complexometric indicator in titrations, particularly for determining metal ions such as calcium and magnesium. It appears as a dark blue or violet powder and is soluble in water, forming a red solution at acidic pH levels. The compound is characterized by its ability to form stable complexes with metal ions, which is crucial for its application in analytical chemistry. Eriochrome Black T has a molecular formula of C20H12N3NaO7S and features a sulfonic acid group that enhances its solubility in aqueous solutions. Its color change from blue to red as the pH shifts from alkaline to acidic makes it a valuable tool in various titrimetric analyses. However, it is important to handle this compound with care, as it may pose health risks if ingested or inhaled, and appropriate safety measures should be taken during its use in laboratory settings.
Formula:C20H13N3O7S·Na
InChI: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);
InChI key:InChIKey=YUJFCGQWGATJPG-UHFFFAOYSA-N
SMILES:S(=O)(=O)(O)C=1C2=C(C(N=NC3=C(O)C4=C(C=C3)C=CC=C4)=C(O)C1)C=CC(N(=O)=O)=C2.[Na]
Synonyms:
  • Erichrome Black T
  • sodium 3-hydroxy-4-[(1-hydroxy-2-naphthyl)azo]-7-nitro-naphthalene-1-sulfonate
  • Chromogene Black ET
  • Eriochrome Balck T
  • C.I. Mordant Black 11, monosodium salt (8CI)
  • Mordant black 11
  • Eriochrome Black T
  • Eriochrome (R) black T
  • 3-Hydroxy-4-(1-hydroxy-2-naphthylazo)-7-nitro-1-naphthalenesulfonic acid, sodium salt
  • 2-Hydroxy-1-(1-hydroxy-2-naphthylazo)-6-nitro-4-naphthalenesulfonic acid, sodium salt
  • See more synonyms
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