The solubility of gallic acid was measured in pure water, ethanol and (water + ethanol) mixtures, at different temperatures ranging from (293.15 to 318.15) K. This complementary study permits us to extend our solubility data basis of gallic acid [14–17].
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]: