Volumetric, isentropic compressibility and electrical conductivity of solutions of tri-sodium phosphate in 1-propanol + water mixed-solvent media over the temperature range of 283.15–303.15 K
Introduction
The salt in mixed solvent plays an important role in scientific research and the chemical industry, such as recycling of organic solvent in a mixed-solvent system, design of extractors, separation of mixtures, biological process, etc. Thermodynamic properties of mixed-solvent electrolyte systems are necessary for a fundamental understanding of the phase-forming ability and also for the development of theoretical models for design and simulation of these processes. Studies on the volumetric and conductometric studies of electrolytes in different mixed solvent systems are of great importance to obtain information as to the solvation and association behavior of ions in solutions.
In continuation of our previous works on the volumetric properties of phosphate salts in aqueous 1-propanol solutions [1], [2], here we present our results on density, sound velocity and conductometric measurements of tri-sodium phosphate in 1-propanol + water mixed-solvent media containing 0.00, 0.05, 0.10, and 0.15 mass fractions of 1-propanol at various temperatures. Although there are some very limited reports on the density [3], [4], [5] and electrical conductivity [6], [7], [8] of binary aqueous Na3PO4 solutions, however there are no experimental data on the ultrasonic velocity of aqueous solutions of Na3PO4 at different temperature in the literature. Furthermore, volumetric, isentropic compressibility and conductometric behavior of Na3PO4 in aqueous 1-propanol solutions are scarce.
Section snippets
Materials
1-Propanol was obtained from Merck (GR, min 99.5%). Tri-sodium phosphate (Na3PO4·12H2O) was obtained from Merck (GR, min 99.5%). The alcohol and salt were used without further purification, and double distilled, deionized water was used.
Apparatus and procedures
All the solutions were prepared by mass on a Sartorius CP124S balance precise to within ±0.0001 g. The density and sound velocity of the mixtures were measured at different temperatures with a digital vibrating-tube analyzer (Anton Paar DSA 5000, Austria) with
Results and discussion
Density (d) and sound velocity (u) values for various Na3PO4 solutions determined at T = 283.15, 288.15, 293.15, 298.15 and 303.15 K are given in Table 1. Experimental data of molar conductivity (Λm) for investigated systems at T = 283.15, 288.15, 293.15, 298.15 and 303.15 K are given in Table 2. The following equation has been used for the correlation of experimental density and ultrasonic velocity data:where and are the mass fraction of the salt and alcohol,
Conclusions
Experimental data at T = 283.15–303.15 K of density, sound velocity and electrical conductivity of tri-sodium phosphate in water + 1-propanol mixed-solvent media containing 0.00, 0.05, 0.10, and 0.15 mass fractions of 1-propanol have been reported. The values of apparent molar volumes and isentropic compressibilities of solutions were calculated from the measured data. The results show a positive transfer volume of tri-sodium phosphate from an aqueous solution to an aqueous 1-propanol solution. The
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