PVT properties of concentrated electrolytes. VI. The speed of sound and apparent molal compressibilities of NaCl,Na2SO4, MgCl2, and MgSO4 solutions from 0 to 100°C |
| |
Authors: | Frank J Millero Faina Vinokurova Marino Fernandez J Peter Hershey |
| |
Institution: | (1) Rosenstiel School of Marine and Atmospheric Science, University of Miami, 4600 Rickenbacker Causeway, 33149-1098 Miami, FL |
| |
Abstract: | The sound velocities of aqueous NaCl, Na2SO4, MgCl2, and MgSO4 solutions were measured from 25 to 95°C in 10o intervals from dilute to saturated solutions. The results were combined with our earlier data and fitted to functions of molality and temperature to within ±0.4 m-sec–1. The adiabatic compressibilities S were calculated from sound speeds and used to calculate the adiabatic apparent molal compressibilities ![xgr](/content/m1j461156vn73020/xxlarge958.gif) . Isothermal compressibilities and isothermal apparent molal compressibilities ![chi](/content/m1j461156vn73020/xxlarge967.gif) were calculated from S using literature values for the expansibilities and heat capacities. The values of ![chi](/content/m1j461156vn73020/xxlarge967.gif) were extrapolated to infinite dilution using the Debye-Huckel limiting law to determine partial molal compressibilities. The apparent molal compressibilities were fitted to Pitzer's equations. The Pitzer parameters for the concentration dependence of ![chi](/content/m1j461156vn73020/xxlarge967.gif) were determined as a function of temperature. Correlations of ![chi](/content/m1j461156vn73020/xxlarge967.gif) and V at various temperatures were found for the electrolytes. |
| |
Keywords: | Sound speeds compressibilities partial molal compressibilities NaCl Na2SO4 MgCl2 MgSO4 Pitzer theory |
本文献已被 SpringerLink 等数据库收录! |
|