In this work, a temperature dependent thermodynamic model based on heat capacity was proposed to predict the osmotic and mean ion activity coefficients of metal chloride aqueous solutions. The CaCl2-H2O system was used to verify the model and the results show the predicted values can well agree with the reported data, indicating that the proposed thermodynamic model is reliable. Meanwhile, the heat capacities at constant pressure of both CuCl2-H2O and NiCl2-H2O systems in the range from 298.15 K to 363.15 K were calculated from the enthalpy changes determined by the calorimetric experiments. Therefore, the osmotic and mean ion activity coefficients of the two systems within 4 mol*kg-1 were predicted in a wide temperature range with the established model. The calculated results were well consistent with the data in literatures and further indicate the thermodynamic model was reliable and convenient.
Compounds
#
Formula
Name
1
Cl2Cu
copper chloride
2
Cl2Ni
nickel chloride (NiCl2)
3
H2O
water
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.
Type
Compound-#
Property
Variable
Constraint
Phase
Method
#Points
POMD
3
Molar heat capacity at constant pressure, J/K/mol ; Liquid
Temperature, K; Liquid
Pressure, kPa; Liquid
Liquid
Flow calorimetry
14
POMD
1
3
Molar heat capacity at constant pressure, J/K/mol ; Liquid
Temperature, K; Liquid
Molality, mol/kg - 1; Liquid
Pressure, kPa; Liquid
Liquid
Flow calorimetry
96
POMD
2
3
Molar heat capacity at constant pressure, J/K/mol ; Liquid