A new vibrating-tube densimeter, combined with a new detection method for determining phase transitions, was used to measure vapor pressures p and densities ρ at several pressures near saturation for aqueous solutions of NaCl, KCl, and CaCl 2 at molality m = (0.25, 0.5, 1, and 3) mol·kg -1 and temperature T = 623 K. CaCl 2 solutions were also measured at T = 643 K. The measured difference Δρ in density between pure water and the solution was used to calculate the density of the solution, the molar volume, and the average compressibility of the solution. The uncertainties of the measurements were: vapour pressure, ±0.004·p; Δρ = ±(0.0005+10 -4 Δp/MPa) g·cm -3 .
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics
- Materials Science(all)
- Physical and Theoretical Chemistry