The vapor pressures of aqueous NaCl + KBr and NaBr + KCl solutions were measured in the temperature range from 303.15 to 333.15 K and the electrolyte concentration range from 1 to 4 m. The experimental data showed that vapor pressures of these two aqueous mixed electrolyte solutions increase with increasing temperatures and almost linearly decrease with increasing concentrations of electrolyte. The experimental data also showed that, since these two aqueous mixed electrolyte solutions contain the same ions, an identical vapor pressure was observed at the same temperature and electrolyte concentration. This observation is consistent with the well understood fact that the particle interactions are identical in these solutions because the strong electrolytes are completely ionized in solution and have the same effect on the thermodynamic properties of water. The vapor pressures of these solutions were also estimated with the model of two-ionic-parameters for ion activity coefficient estimations proposed by Lin and Lee. The average absolute deviation (AAD) and the average absolute relative deviation (AARD) of NaCl + KBr aqueous solution are 0.05 kPa and 0.41%, respectively, and those of NaBr + KCl aqueous solution are 0.05 kPa and 0.40%, respectively.
Compounds
#
Formula
Name
1
ClNa
sodium chloride
2
BrK
potassium bromide
3
BrNa
sodium bromide
4
ClK
potassium chloride
5
H2O
water
6
ClLi
lithium chloride
Datasets
The table above is generated from the ThermoML associated json file (link above).
POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied;
the numbers refer to the table of compounds on the left.