ABSTRACT

Solubility of RbCl(cr) and CsCl(cr) in pure water were determined at subzero temperatures. The solubility of RbCl(cr) and CsCl(cr) decreased with temperature increment. Specific heat capacity of RbCl(aq) and CsCl(aq) solutions were determined at 298.15 K and concentration to near saturation. The specific heat capacity of RbCl(aq) and CsCl(aq) solutions decreased with concentration increment and for the same molality the specific heat capacity of CsCl(aq) is smaller than that of RbCl(aq). A temperature dependent thermodynamic model based on the Pitzer-Simonson-Clegg activity coefficient equations was used to represent the activity, thermal and solid-liquid equilibria properties of RbCl + H2O and CsCl + H2O systems. The obtained models can reproduce and predict the thermodynamic properties and phase diagram of the two binary systems well for the temperature range from 200 K to 370 K. The present models have an advantage especially at subzero temperatures due to the utilization of low temperature solubility experimental data in parameterization.

Compounds

#	Formula	Name
1	ClNa	sodium chloride
2	ClRb	rubidium chloride
3	ClCs	cesium chloride
4	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	4	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Flow calorimetry	1
POMD	4 2	Molality, mol/kg - 2 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid Crystal - 2	gravimetric method	6
POMD	4 2	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Molality, mol/kg - 2; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Flow calorimetry	9
POMD	3 4	Molality, mol/kg - 3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid Crystal - 3	gravimetric method	6
POMD	3 4	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Molality, mol/kg - 3; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Flow calorimetry	9
POMD	1 4	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Molality, mol/kg - 1; Liquid Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Flow calorimetry	1

Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Solubility of RbCl and CsCl in pure water at subzero temperatures, heat capacity of RbCl(aq) and CsCl(aq) at T = 298.15 K, and thermodynamic modeling of RbCl + H2O and CsCl + H2O systems

Gao, D.[Dandan], Li, D.[Dongdong], Li, W.[Wu]

ABSTRACT