Protonation equilibria of carminic acid and stability constants of its complexes with some divalent metal ions in aqueous solution

Hasan Atabey, Hayati Sari*, Faisal N. Al-Obaidi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

The dissociation constants of carminic acid (7-D-glucopyronosyl-3,5,6,8-tetra- hydroxy-1-methyl-9,10-dioxo-anthracene-2-carboxylic acid) (CA), together with the stability constants of its Cu(II), Zn(II), Ni(II), Co(II) and Hg(II) complexes, were studied potentiometrically in aqueous medium at 25.0 (1) A degrees C, and at the ionic background of 0.1 mola Zn(II) > Ni(II) > Co(II) > Hg(II).

Original languageEnglish
Pages (from-to)793-803
Number of pages11
JournalJournal of Solution Chemistry
Volume41
Issue number5
DOIs
Publication statusPublished - Jun 2012
Externally publishedYes

Keywords

  • Carminic acid
  • Potentiometric titration
  • Stability constant
  • Protonation constant
  • SUPERQUAD
  • SPECTROPHOTOMETRIC DETERMINATION
  • PK(A) VALUES
  • CALIBRATION
  • COCHINEAL
  • WATER
  • PH

Cite this