The enthalpy of formation of magnesium sulfate ion pairs

Wing H. Leung, Frank J Millero

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

The enthalpies of dilution of lithium, sodium, potassium, and magnesium chloride and sulfate solutions in the range 0.1 to 1.0 m have been measured at 30°C with a microcalorimeter. The relative apparent enthalpies φL of these solutions have been determined with the aid of an extended form of the Debye-Hückel limiting law {Mathematical expression} where SH is the limiting-law slope, σ = 3/I3/2 × [(1+I1/2 - 1/(1+I1/2 - 2 ln (2+I1/2)], and B and C are empirical constants. This equation fits the experimental results to within a standard deviation of 2 cal-mole-1 for all the salts. The measured φL for the MgSO4 solutions were compared to those calculated using the additivity principle, φL(MgCl2) + φL(Na2SO4) - 2φL(NaCl), and the extended Debye-Hückel equation. The results of this comparison have been used to calculate the ΔHA o for the formation of MgSO4 0. A value of ΔHA o = 1.15 to 1.36 was obtained, depending upon the φL estimates for the free ions Mg2+ and SO4 2-. The results are briefly discussed and compared to the results obtained by other workers.

Original languageEnglish (US)
Pages (from-to)145-159
Number of pages15
JournalJournal of Solution Chemistry
Volume4
Issue number2
DOIs
StatePublished - Feb 1975

Fingerprint

magnesium sulfates
Magnesium Sulfate
Enthalpy
Magnesium Chloride
enthalpy
Ions
magnesium chlorides
Lithium Chloride
lithium chlorides
ions
potassium chlorides
Potassium Chloride
sodium chlorides
Sodium Chloride
Dilution
calorimeters
dilution
standard deviation
Salts
slopes

Keywords

  • dilution
  • Enthalpy
  • ion pairs
  • lithium, sodium, and potassium chlorides and sulfates

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

The enthalpy of formation of magnesium sulfate ion pairs. / Leung, Wing H.; Millero, Frank J.

In: Journal of Solution Chemistry, Vol. 4, No. 2, 02.1975, p. 145-159.

Research output: Contribution to journalArticle

Leung, Wing H. ; Millero, Frank J. / The enthalpy of formation of magnesium sulfate ion pairs. In: Journal of Solution Chemistry. 1975 ; Vol. 4, No. 2. pp. 145-159.
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