Similarly for the succinic acid, the choice of pK A,1 and pK A,2 together with the equilibrium constant, defined in Eq. 16, uniquely defines all other equilibrium constants, Eq. 17 dominant form, without loss of generality, in the limit of high pH is SuA 2 -. Accordingly, the mean counts of forms HSuA -an H 2 SuA are low and the concentrations can not be determined accurately due to the finite-size effects on the fluctuations.