The effect of pressure on the ionization of water at various temperatures from molal-volume data1

Frank J Millero, Edward V. Hoff, Larry Kahn

Research output: Contribution to journalArticle

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Abstract

The apparent molal volumes of dilute (0.002 to 1.0 m) aqueous HCl and NaOH solutions have been determined at 0, 25, and 50°C and NaCl solutions at 50°C. The partial molal volumes ( {Mathematical expression}) of HCl, NaOH, and NaCl solutions have been determined from these apparent molal volumes and other reliable data from the literature. The partial-molal-volume changes ( {Mathematical expression}) for the ionization of water, H2O→H++OH-, have been determined from 0 to 50°C and 0 to 1 m ionic strength from the partial molal volumes of HCl, NaOH, NaCl, and H2O. The partial molal compressibilities ( {Mathematical expression} for HCl, NaOH, NaCl, and H2O have been estimated from data in the literature and used to determine the partial molal compressibility changes ( {Mathematical expression}) for the ionization of water from 0 to 50°C and 0 to 1 m ionic strength. The effect of pressure on the ionization constant of water has been estimated from partial-molal-volume and compressibility changes using the relation {Mathematical expression} from 0 to 50°C and 0 to 2000 bars. The results agree very well with the directly measured values.

Original languageEnglish (US)
Pages (from-to)309-327
Number of pages19
JournalJournal of Solution Chemistry
Volume1
Issue number4
DOIs
StatePublished - Oct 1972

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Keywords

  • Effect of pressure
  • ionization of water
  • molal volume

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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