Hence, each kind of diprtotic acid has two different acid-dissociation equilibrium constants, Ka 1 and Ka 2.
2.
According to Gibbs free energy equation, the relation between dissociation equilibrium constant, K d, and the components of free energy was built.
3.
The corresponding conjugate base of each conjugate acid state also has a different base-dissociation equilibrium constant K b1 and K b2, respectively.
4.
When other reactions were studied using these parameters, a correlation was not always found due to the specific derivation of these parameters from the dissociation equilibrium of substituted benzoic acids and the original negligence of resonance effects.