Partition of Carboxylic Acids between Benzene and Aqueous Solution as Considered from the Regular Solution Theory

The partition of carboxylic acids between benzene and 0.1 mol dm−3(H,Na)ClO4 aqueous solution has been studied at 25 °C. Carboxylic acids used include acetic, propanoic, butanoic, pentanoic, hexanoic, and decanoic acids. The hydration of monomeric acids in benzene being taken into account, the hydration-corrected partition constant has been calculated. The effect of the chain length on the partition is accounted for with the aid of the newly estimated solubility parameters and empirical binary coefficients. Applicability of the empirical solubility parameter of water (35.89 J1⁄2 cm−3⁄2) has also been discussed.