Solutions

• Conformal solution theory
• Kirkwood-Buff theory of solutions
• Scatchard-Hildebrand regular solution theory

Ionic solutions

• Poisson–Boltzmann equation

General reading

• John G. Kirkwood and Frank P. Buff "The Statistical Mechanical Theory of Solutions. I", Journal of Chemical Physics 19 pp. 774-777 (1951)
• Arieh Ben-Naim "Molecular Theory of Solutions", Oxford University Press (2006) ISBN 0199299706
• Robert M. Mazo "Concentration fluctuations in fluid mixtures", Journal of Chemical Physics 129 154101 (2008)