The System Nacl-cacl2-h2o. 2. Densities for Ionic Strengths of 0.1- 19.2 Mol.kg-1 At 298.15 and 308.15 K and At 0.1 Mpa.
Oakes-CS; Simonson-JM; Bodnar-RJ
J Chem and Eng Data 1990 35(3):304-309.
Densities for ternary solutions in the system nacl-cacl2-h2o were measured with a vibrating-tube densimeter at 298.15 +- 0.09 And 308.15 +- 0.03 K and 0.1 Mpa and over a range of ionic strengths from 0.1 to 19.2 Mol.Kg-1. The present results are in excellent agreement with previously published data for the nacl-h2o binary and are in very good agreement with the more precise of the available data for the cacl2-h2o binary at 298.15 K. Very large discrepancies between the results of the three most recent reports of densities for the cacl2-h2o system at 308.15 K are resolved here, improving both the accuracy and precision for this system. Most significantly, the results reported here substantially expand the volumetric data base for ternary solutions. On the basis of the results of this study, most of the previously reported 308.15 K density data in the ternary system appear to contain large errors. We have evaluated the data within the framework of the pitzer formalism and obtained new values for the ion interaction and mixing parameters for this ternary system. In addition to the parameters determined from the binary end-member solutions, it was found that only 0vnaca (greek theta) was needed to represent the ternary results.
OP; Final Contract Report;
J. Chem. and Eng. Data, V. 35, No. 3, 1990, PP. 304-309.
Virginia Polytechnic Instit.