Spectrophotometric determination of dissociation constants for propionic acid and 2,5-dinitrophenol at elevated temperatures

In J. Lee, Gang Sook Jung, Keon Kim

Research output: Contribution to journalArticle

13 Citations (Scopus)


Using the temperature dependence of pKa for acetic acid, the pKa for 2,5-dinitrophenol have been spectrophotometrically determined in acetate buffer at elevated temperatures under the saturation vapor pressures. For 2,5-dinitrophenol {Mathematical expression} where T is in Kelvin. Similarly, pKa values of propionic acid were obtained at temperatures from 25°C to 175°C producing {Mathematical expression} From this result, several thermodynamic functions of propionic acid were calculated and compared with those obtained from emf measurement.

Original languageEnglish
Pages (from-to)1283-1292
Number of pages10
JournalJournal of Solution Chemistry
Issue number12
Publication statusPublished - 1994 Dec 1



  • 2,5-dinitrophenol
  • acid dissociation constant
  • optical indicator
  • p K
  • pH
  • propionic acid
  • thermodynamic function

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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