Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Thermodynamics of complexation of aqueous 18-crown-6 with potassium ion: apparent molar volumes and apparent molar heat capacities of aqueous 18-crown-6 and of the (18-crown-6 + potassium chloride) complex at temperatures (278.15 to 393.15) K, at molalities (0.02 to 0.3) mol.kg-1, and at the pressure 0.35 MPa

Niederhauser, T. L., Brown, B. R., Ziemer, S. P., Sargent, J. D., Woolley, E. M.[Earl M.]
J. Chem. Thermodyn. 2004, 36, 12, 1067-1077
ABSTRACT
We have measured the densities at temperatures T = (278.15 to 363.15) K and heat capacities at T = (278.15 to 393.15) K of aqueous solutions of 18-crown-6 and of (18- crown-6 + KCl) at molalities m = (0.02 to 0.3) mol ? kg-1 and at the pressure 0.35 MPa. We have calculated apparent molar volumes V f and apparent molar heat capacities Cp, f for 18-crown-6(aq), and we have applied Young?s Rule and have accounted for chemical speciation and relaxation effects to resolve V f and Cp, f for the (18-crown-6?K+, Cl-)(aq) complex in the mixture. We have also calculated estimates of the change in volume .rVm, the change in heat capacity .rCp,m, the change in enthalpy .rHm, and the equilibrium quotient log Q for formation of the complex at T = (278.15 to 393.15) K and m = (0 to 0.3) mol ? kg-1.
Compounds
# Formula Name
1 C12H24O6 1,4,7,10,13,16-hexaoxacyclooctadecane
2 ClK potassium chloride
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
  • 1
  • Apparent molar heat capacity, J/K/mol ; Liquid
  • Temperature, K; Liquid
  • Molality, mol/kg - 1; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Extra sensitive DSC
  • 264
  • POMD
  • 3
  • 1
  • Apparent molar volume, m3/mol ; Liquid
  • Temperature, K; Liquid
  • Molality, mol/kg - 1; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Calculated with densities of this investigation
  • 121
  • POMD
  • 2
  • 3
  • 1
  • Apparent molar heat capacity, J/K/mol ; Liquid
  • Temperature, K; Liquid
  • Molality, mol/kg - 1; Liquid
  • Molality, mol/kg - 2; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Extra sensitive DSC
  • 240
  • POMD
  • 2
  • 3
  • 1
  • Apparent molar volume, m3/mol ; Liquid
  • Temperature, K; Liquid
  • Molality, mol/kg - 1; Liquid
  • Molality, mol/kg - 2; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Calculated with densities of this investigation
  • 110