Apparent molal volumes and adiabatic compressibilities of aqueous transition metal chlorides at 25°C

Antonio Lo Surdo, Frank J. Millero

Research output: Contribution to journalArticlepeer-review

55 Scopus citations

Abstract

The apparent molal (φV) volumes and adiabatic [φK(S)] compressibilities of aqueous solutions of some transition metal (Mn2+, Co2+, Ni2+, Cu2+, Zn2+, and Cd2+) chlorides in the molality range 0 ≤ m ≤ 1.0 have been determined from precise density and sound speed measurements at 25°C. φV and φK(S) have been extrapolated to infinite dilution with the aid of an extended Debye-Hückel equation. The infinite dilution partial molal (V0) volumes and compressibilities (Ks0) for the transition and alkaline earth metal ions have been used to examine the ion-solvent interactions. The electrostriction partial molal volumes, V̄0(elect) = V̄0(ion) - V̄0(int), and compressibilities, K̄0(elect) = K̄0(ion) - K̄0(int), yield values of 11.1 ± 1.5 and 8.2 ± 1.2, respectively, for the number of water molecules hydrated to the cations. Correlations of V̄0(elect) and K̄0(elect) with various properties (radius, hydration, enthalpy, entropy, and heat capacity) of the transition metal and group 2A ions show variations which appear to be related to the d orbitals, similar to other thermodynamic properties.

Original languageEnglish (US)
Pages (from-to)710-715
Number of pages6
JournalJournal of physical chemistry
Volume84
Issue number7
StatePublished - Dec 1 1980

ASJC Scopus subject areas

  • Engineering(all)
  • Physical and Theoretical Chemistry

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