ABSTRACT
This chapter explores the roles played by the Helmholtz and Gibbs free energies of ionic solutions to reconsider the derivation of the thermodynamic quantities in the original Debye-Huckel theory. Changing the number of the small ions independently is not a meaningful process. There must be a concomitant change in the valency of the macroions to preserve charge neutrality. It is a crucial error to omit the chemical potential of effective valency of the particles. There is no magical energy of adsorption associated to consider criticisms of SSS theory. The chapter shows that second diversion into the world of colloidal spheres is demonstrated to take a global view of the properties of a system but the advantage of the Sogami potential becomes apparent only when global properties of the system is considered. Both potentials are used to give a satisfactory explanation of some photothermal compression data on colloidal spheres.
