CORRELATION OF THERMODYNAMIC DATA FOR AQUEOUS-ELECTROLYTE SOLUTIONS TO VERY HIGH IONIC-STRENGTH USING INSIGHT - VAPOR SATURATED WATER ACTIVITY IN THE SYSTEM CACL2-H2O TO 250-DEGREES-C AND SOLID SATURATION

Osmotic coefficients for the CaCl2-H2O system between 25 and 250 degre es C and from the dilute region to solid saturation or beyond (i.e., t o approximate to 12 mCaCl(2) at the lowest temperature and approximate to 32 mCaCl(2) at the highest) have been correlated using the followi ng permutations and modifications of the basic Fitter ion-interaction equation: (1) the basic Fitter equation, (2) the Fitter equation augme nted by an ionic strength-dependent third virial contribution, (3) the Fitter equation together with equilibria involving the formation of C aCl+ and CaCl20, and (4) the simultaneous combination of all of the ab ove. The effectiveness, accuracy, and practicality of each approach ar e reviewed.