The density differences, Ap = p -p0 (where p = density of the solution and p0 Is the density of H20), of NaCI, MgCI2, KCI, NaBr, LICI, and CaCI2 aqueous solutions have been measured from 0.1013 to 40 MPa and for molalities of 0.05-5.0 mol kg'1 at 298.15 K. (MgCI2 and KCI molaHty ranges were 0.05-3.0 mol kg'1.) These results have been least-squares fitted by a polynomial equation In molality and pressure, with standard errors less than 50 X 10'* g cm'3. A comparison of these equations with available literature data Is also Included.
The difference In density between pure water and CaClg(aq) has been measured with a vibrating tube densimeter at molalities from 0.05 to 6.4 mol kg'1, temperatures from 323 to 600 K, and pressures up to 40 MPa. The results were fitted to a cubic spline surface In three dimensions (P, T, and m). The data extend the range of experimental data for CaCI2(aq) to 600 K.
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