To validate the method of solubility determination, the solubility
of gallic acid in pure solvents was determined from (293.15 to
318.15) K. As shown in figure 1, solubilities values are similar to
those reported in the literature. Compared to pure water, the solubility
of gallic acid in pure ethanol is the highest and is more
dependent on temperature. This solubility temperature dependence
was fitted to the empirical equation proposed by Heidman
et al.[18]: