Abstract
The aim of this research work was to theoretically calculate the pKa value of boric acid in aqueous solution by theoretical methods at T=298.15 K. Boric acid has antifungal and antiviral properties. It is used in various prescription pharmaceutical products. The ab initio and density functional theory (DFT) methods were used in this research work. To explain the determined acidic dissociation constant, the various molecular conformations and solute-solvent interactions of the species of boric acid were considered. The basis set at the B3LYP/6-31+G (d) level of theory was selected for DFT calculations. We analyzed the formation of intermolecular hydrogen bonds between several species of boric acid and water molecules through Tomasi's method. The result showed that there was comparable agreement between the experimentally and theoretically determined pKa values for boric acid.
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