“…The particles of some substances hold water molecules weakly, others strongly. Since the hydration process generally characterizes all energetic and structural changes occurring in a solution, it is very important to determine the size of the hydration layer and the hydration number (Pissis & Kyritsis, 2013;Paez et al, 2018;Mehrdad et al, 2011;Sosa et al, 2018;Bagirova, 2019).…”