Apparent Molal Volumes of Aqueous NaF, Na2S04, KCl, K2SO4, MgCl2, and MgSO4 Solutions at 0° and 50°C

Frank J. Millero, Jonathan H. Knox

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The apparent molal volumes, ΦV's, of dilute (0.002-1m) aqueous solutions of NaF, Na2SO4, KCl, K2SO4, MgCl2, and MgSO4 are determined at 0° and 50°C from precision density measurements made with a magnetic float densitometer. The infinite dilution apparent molal volumes, ΦV°'s, are determined by using the Redlich equation, ΦV = ΦV° + SVc1/2 + bVc, where SV is the Debye-Hückel limiting law slope, and by is a deviation constant. At 0°C the deviations are positive for all the salts except MgCl2. The temperature dependence of the by for all the salts is similar to other commnn electrolytes (∂bV/∂T is negative). The effect of temperature on the ΦV°'s of all the electrolytes is similar in that ∂2ΦV°/∂T2 is negative. The ion-ion and ion-water interactions responsible for the observed behavior of the ΦV's are briefly discussed.

Original languageEnglish (US)
Pages (from-to)407-411
Number of pages5
JournalJournal of Chemical and Engineering Data
Issue number4
StatePublished - Oct 1 1973

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)


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