Activity coefficients for the (CaCl2 + amino acid + water) system were determined at a temperature of 298.15 K using ion-selective electrodes. The range of molalities of CaCl2 is (0.01 to 0.20) mol kg-1, and that of amino acids is (0.10 to 0.40) mol kg-1. The activity coefficients obtained from the Debye Huckel extended equation and the Pitzer equation are in good agreement with each other. Results show that the interactions between CaCl2 and amino acid are controlled mainly by the electrostatic interactions (attraction). Gibbs free energy interaction parameters (gEA) and salting constants (kS) are positive, indicating that these amino acids are salted out by CaCl2. These results are discussed based on group additivity model.
Compounds
#
Formula
Name
1
C3H7NO3
L-serine
2
C5H9NO2
L-proline
3
CaCl2
calcium 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.