Spectrophotometric determination of the acid dissociation constants for cacodylic acid and p-nitrophenol at elevated temperatures

Tae Wook Shin, Keon Kim, In J. Lee

Research output: Contribution to journalArticle

12 Citations (Scopus)


Using 2,5-dinitrophenol as an optical indicator, the pKa of cacodylic acid were spectrophotometrically determined at elevated temperatures under saturation vapor pressures. The result is pKa = -26.41 + 1296/T + 4.973 In T where T is in Kelvin. In a similar way, the pKa of p-nitrophenol were obtained up to 200°C giving pKa = -24.82 + 2135/T + 4.353 In T From these results, several thermodynamic functions of cacodylic acid and p-nitrophenol were calculated.

Original languageEnglish
Pages (from-to)379-390
Number of pages12
JournalJournal of Solution Chemistry
Issue number4
Publication statusPublished - 1997 Apr 1



  • 2,5-dinitrophenol
  • Acid dissociation constant
  • Cacodylic acid
  • p-nitrophenol
  • pH
  • pK
  • Thermodynamic function

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this