Speed of Sound in Aqueous and Methanolic Lithium Nitrate Solutions

Abstract

Speeds of sound in aqueous and methanolic lithium nitrate solutions were measured as functions of concentration (0.0181 ≤ m/(mol·kg-1) ≤ 21.818) and temperature (273.15 ≤ T/K ≤ 323.15) at 2 MHz. The isentropic compressibility isotherms for aqueous lithium nitrate solutions converge at 3.75 mol·kg-1, and at this concentration the primary hydration shell of the solute has become just saturated. It has been estimated that there are 15 molecules of water in the primary hydration shell of lithium nitrate, and the calculated primary hydration number of the nitrate ion was found to be 9. For methanolic lithium nitrate solutions, the isentropic compressibility isotherms vary smoothly within the concentration and temperature ranges of study.

(p, ρ, T) properties and apparent molar volumes Vϕ of LiNO3 in methanol

“…But, only few experimental values cover our temperature and molality interval. The comparison of our results with those from reference[5] showed the 0.15% average deviation. The experimental density values of Kiepe et al[6] were determined at T = (283.16 to 313.15) K and m = (0.628 to 4.954) mol AE kg À1 .…”

“…The experimental density values of Kiepe et al[6] were determined at T = (283.16 to 313.15) K and m = (0.628 to 4.954) mol AE kg À1 . The average deviation of these results with our results is ±0.07%.The apparent molar volumes V / of LiNO 3 in methanol are defined by equation(5) and are listed in table 5:…”

“…The values of experimental density were compared with the available literature values [4][5][6]. The results of Skabichevskiy were measured at T = 298.15 K. We used the equation described in reference [4] for the calculation of density values.…”

“…The obtained density values show a deviation of 0.10%. The values of Rohman et al [5] were obtained at T = (296.45 to 323.30) K and m = (0.0184 to 8.542) mol AE kg À1 . The experiments in reference [5] were carried out using a pycnometer with an accuracy of ±0.01% and there are 253 experimental density points of …”

“…The detailed literature analysis were carried out and only three publications with densities and apparent molar volumes of LiNO 3 in methanol were found in the literature [4][5][6] and tabulated in table 1. It can be seen from table 1, that there are no high-temperature-high-pressure values of these systems.…”