ACTIVITY AND OSMOTIC COEFFICIENTS OF AQUEOUS CALCIUM-CHLORIDE AT 298.15-K

A critical evaluation of the mean activity, gamma // plus or minus , and osmotic coefficients, phi , of aqueous calcium chloride at 298. 15 K is presented for the concentration range of 0 to 10 mol multiplied by (times) kg** minus **1. Osmotic coefficents were calculated from direct vapor pressure measurements from isopiestic measurements or from freezing point depression measurements. Activity coefficients were calculated from electromotive force measurements of galvanic cells, both without liquid-junction and with transference, and from diffusion data. A nonlinear least-squares program was used to fit data from all sources using both phi and ln gamma // plus or minus as a function of molality. An eight-parameter extended Debye-Huckel equation describes the osmotic coefficient, the mean activity coefficient, and the excess free energy as a function of molality. The scientific literature has been covered through July, 1976.