Comp. Temp.
K
Dissociation constant Free energy change
kJ mol-1
Enthalpy change
kJ mol-1
Entropy change
J mol-1 K-1
     pK1H     pK2H  ΔG1        ΔG2 ΔH1         ΔH2  - ΔS1   - ΔS2
AAS 298 9.41       4.71 53.69      26.87 32.63      23.58 70.68      9.91
  308 9.24       4.54 54.49      26.77   70.98      9.89
  318 9.05       4.37 55.10      26.60   70.67      9.90
PAAS 298 9.89       5.00 56.43      29.44 29.88     24.50 89.48     13.52
  308 9.72       4.86 57.32      29.36   90.25     13.51
  318 9.64       4.73 58.69      29.28   87.94     13.53
Table 3: Thermodynamic functions for the dissociation of AAS and PAAS in 20 % (by volume) ethanol-water mixture in the presence of 0.1 M KCl at different temperatures.