Vapor-liquid equilibrium data (water activity, vapor pressure, osmotic coefficient, and activity coefficient) of binary aqueous sodium dihydrogen citrate or disodium hydrogen citrate solutions were obtained through the isopiestic method at T ) 298.15 K. Density and speed of sound measurements were carried out on the aqueous solutions of the mentioned electrolytes at T ) (288.15 to 308.15) K at atmospheric pressure. From the experimental density and speed of sound data, the apparent molar volume and isentropic compressibility values were evaluated and fitted to the Pitzer equation from which the apparent molar volume and apparent molar isentropic compressibility of the solutions at infinite dilution were calculated at each temperature within the above-mentioned range.
