SOLVATION OF CARBOXYLATE IONS IN WATER PLUS ACETONE MIXTURES - AN ULTRASONIC STUDY AT 303.15 K

The apparent molar isentropic compressibilities of oxalic, malonic, su ccinic, glutaric and adipic acids have been determined in water and wa ter +0.016, +0.033, +0.072, +0.117, and +0.171 mole fraction acetone m ixtures from ultrasonic velocity measurements in varying ranges of con centration at 303.15 K. The solvation numbers of the acids have been d etermined in these solvents. The results are discussed in the light of solute-solvent interactions. The result suggests that the apparent mo lar isentropic compressibility and the solvation number change with in crease in hydrophobic chain length (-CH2-groups) of homologous dicarbo xylic acids.