1. Introduction
When mixing fresh and salt water, osmotic processes are taken as
promising for producing clean energy [1–6]. The energy produced
may be stored as a potential energy in the environment. It is widely
held that the energy produced by mixing two solutions of different concentrations
is due to the Gibbs energy [1–6]. The environment is not
commonly considered. The goal of the present paper is to reveal the
role of the Gibbs energy in energy production upon solution mixing
with regard to the processes occurring in both solutions and the environment.
To this end, we consider the change in entropy upon mixing
for both the environment and solutions.