  The thesis focuses on the prediction of solvation thermodynamics using
integral equation theories. Our main goal is to improve the approach using a
rational correction. We achieve it by extending recently introduced pressure
correction, and rationalizing it in the context of solvation entropy. The
improved model (to which we refer as advanced pressure correction) is rather
universal. It can accurately predict solvation free energies in water at both
ambient and non-ambient temperatures, is capable of addressing ionic solutes
and salt solutions, and can be extended to non-aqueous systems. The developed
approach can be used to model processes in biological systems, as well as to
extend related theoretical models further.
