From an energetic aspect, the dissolution of a gallic acid into a liquid is related to some thermodynamic changes, specifically the Gibbs energy (DsolG), molar enthalpy (DsolHo) and molar entropy (DsolS) of dissolution. These thermodynamic’s parameters can be calculated using the experimental solubility data fitted to equation (4). These parameters reflect the modification of the solution properties due to the presence of the solute at its infinite dilution state at a given temperature [19–21]. Assuming that the activity coefficient of water in aqueous phase is equal to 1 therefore, with the
help of the Gibbs–Helmholtz equation, the following equation can be obtained [22]: