The solubility of gallic acid in (water + ethanol) binary solvents was determined from (293.15 to
318.15) K at atmospheric pressure using a thermostatted reactor and UV/vis spectrophotometer analysis.
The effects of binary solvents composition and temperature on the solubility were discussed. It was found
that gallic acid solubility in (water + ethanol) mixed solvents presents a maximum-solubility effect. Two
empirical equations were proposed to correlate the solubility data. The calculated solubilities show good
agreement with the experimental data within the studied temperature range. Using the experimentally
measured solubilities, the thermodynamic properties of dissolution of the gallic acid such as Gibbs energy
(DsolG), molar enthalpy of dissolution (DsolH), and molar entropy of dissolution (DsolS) were calculated.
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