Experimental sound speeds and derived compressibilities of the KCl (1) + CaCl₂ (2) + water (3) and KCl (1) + MgCl₂ (2) + water (3) systems up to an ionic strength of 4 mol kg^-1 at 298.15 k

Abstract

The experimental sound velocities of mixtures composed of KCl + CaCl₂ + water and KCl + MgCl₂ + water are reported at 298.15 K at several ionic strengths in the full mixture composition range. These sound velocities, in conjunction with the earlier published densities, have been employed to estimate the mean apparent molal compressibilities of the mixtures. These mean apparent molal compressibilities of the mixtures have been analyzed by the Pitzer equations without and with binary interaction parameters. The calculated properties with the help of binary interaction parameters show good agreement with those obtained from the experiments. The excess compressibilities examined in light of the Friedman equation have been correlated with excess volumes and enthalpies.