Effect of temperature on compressibility properties of 0.1, 0.5 and 1.0 molal solutions of alkali metal halides. Part 1. Aqueous solutions of sodium chloride, sodium bromide, sodium iodide, potassium chloride, potassium bromide, potassium iodide, rubidium chloride and rubidium iodide in the 278.15 K to 353.15 K temperature range

Sound velocities, in aqueous 0.1 mol.kg(-1), 0.5 mol.kg(-1) and 1.0 mol.kg(-1) solutions of NaCl, NaBr, NaL KCl, KBr, K1, RbCI and Rbl were measured at 1K intervals from T= (278.15 to 353.15) K. Determined sound velocities and densities served to determine the isentropic and isothermal compressibility coefficients, the apparent molar compressibilities, the apparent molar volumes, the isochoric thermal pressure coefficients, cubic expansion coefficients, changes of heat capacities with volume and with pressure, and the hydration numbers. In addition were evaluated the ultrasonic relaxation times and corresponding thermodynamic functions of the activation of the viscous process. Determined parameters are qualitatively correlated with changes in the structure of water when alkali metal halides are dissolved in it. (C) 2017 Elsevier B.V. All rights reserved.