Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

Activity Coefficients of RbF in Urea Water and Formamide Water Mixtures from Potentiometric Measurements

Xiuhua Hao, S. L.[Shuni Li], Zhai, Q.[Quanguo], Jiang, Y.[Yucheng], Hu, M.[Mancheng]
J. Chem. Eng. Data 2016, 61, 1, 220-227
ABSTRACT
The potentiometric method was used to obtain mean activity coefficients of RbF in urea/formamide water mixed solvents at 298.2 K. The weight fractions of amide were varied from 0 to 40 %. The Pitzer, modified Pitzer and extended Debye Huckel equations were used for representing the mean activity coefficients and other related thermodynamic properties of the systems. Furthermore, corresponding parameters of the thermodynamic models mentioned herein before were also obtained.
Compounds
# Formula Name
1 CH4N2O urea
2 H2O water
3 FRb rubidium fluoride (RbF)
4 CH3NO formamide
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
  • 1
  • 2
  • 3
  • Mean ionic activity coefficient - 3 ; Liquid
  • Molality, mol/kg - 3; Liquid
  • Solvent: Mass fraction - 1; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Calculated from EMF cell potential
  • 116
  • POMD
  • 4
  • 2
  • 3
  • Mean ionic activity coefficient - 3 ; Liquid
  • Molality, mol/kg - 3; Liquid
  • Solvent: Mass fraction - 4; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Calculated from EMF cell potential
  • 114
  • POMD
  • 2
  • 3
  • Mean ionic activity coefficient - 3 ; Liquid
  • Molality, mol/kg - 3; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Calculated from EMF cell potential
  • 45