Conductometric studies of dissociation constants of selected monocarboxylic acids a wide range of temperatures

Abstract

The electrical conductivities of aqueous solutions of formic acid, acetic acid, propionic acid, butyric acid, valeric acid and caproic acid were measured in the temperature range from T = (283.15 to 313.15) K and in the concentration range m = (0.03048·10−3–25.69·10−3) mol∙dm−3. The data were analyzed according to Barthel's low-concentration chemical model to obtain the values of dissociation constant (Kd) and association constant (KA). The changes in the determined thermodynamic functions ΔHd, ΔSd, and ΔGd were also compared with changes in aliphatic chain length and carboxylic acid structure.