Heat capacity changes for the lonization of aqueous phenols at 25°C

Harry P. Hopkins, Wayne C. Duer, Frank J. Millero

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


The apparent molal heat capacities {Mathematical expression} have been determined at 25°C for phenol, meta-nitrophenol, para-nitrophenol, meta-cyanophenol, and para-cyanophenol and the corresponding sodium salts in water at several concentrations. These values have been extrapolated to infinite dilution to provide the {Mathematical expression} values from which the heat capacity changes for the ionization of the aqueous phenols have been calculated. The observed {Mathematical expression} values are virtually identical within experimental error for the phenols studied. The volume data needed to calculate the {Mathematical expression} values from the experimental data are also reported.

Original languageEnglish (US)
Pages (from-to)263-268
Number of pages6
JournalJournal of Solution Chemistry
Issue number4
StatePublished - Apr 1 1976


  • Molal volume
  • cyanophenols
  • heat capacity
  • ionization
  • nitrophenols
  • phenol
  • sodium salts

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Physical and Theoretical Chemistry


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