Single-Course English 7.5 ECTS

Electrolyte Solution Thermodynamics

Overall Course Objectives

To introduce the participants to the thermodynamics of electrolyte solutions including the relevant models

Learning Objectives

  • Select a proper thermodynamic model for specific electrolyte solutions
  • Perform the conversion between standard state properties on the molality scale and symmetric/unsymmetric mole fraction scales
  • Convert activity coefficients from one scale to another
  • Derive mean activity coefficients, osmotic coefficients and other solution properties from a Gibbs excess function
  • Calculate activity coefficients from fugacity coefficients
  • Determine a proper experimental method for measuring properties of electrolyte solutions
  • Apply the Gibbs-Duhem equation for calculating osmotic coefficients from mean activity coefficients
  • Perform speciation equilibrium calculations
  • Perform solid-liquid, vapour-liquid, and liquid-liquid equilibrium calculations
  • Determine, the temperature, pressure, and composition dependence of equilibrium constants
  • Use phase diagrams for solid-liquid equilibrium of salt solutions
  • Present the Debye-Hückel theory and other theories for electrolyte solutions

Course Content

The aim of the course is to give an introduction to concepts important for understanding and working with electrolyte solution thermodynamics. Topics being discussed include experimental methods for measuring properties of salt solutions, molal, molar and mole fraction activity coefficients, the Nernst equation, Debye-Hückel theory, the Mean Spherical Approximation (MSA) theory, molecular interactions in electrolyte solutions, dielectric properties of solvents and its effect on salt solubility, Born equation, Gibbs energy of transfer, Meisner model, Bromley model, Pitzer model, e-NRTL model, Extended UNIQUAC model, MSE model, equations of state for electrolytes, apparent properties, thermal properties, volumetric properties of electrolytes, phase rule and invariant points.

Recommended prerequisites

MSc Chemical Engineering. Good knowledge of chemical thermodynamics

Teaching Method

Self-study with possibility for some on-line lectures


See course in the course database.





13 weeks


Chemical Engineering


DTU Lyngby Campus

Course code 28928
Course type PhD
Semester start Week 5
Semester end Week 19

15.900,00 DKK