Figure 5.

Dependence of logK_obs on [Na⁺] and pH. logK_obs, determined directly by global analysis of multiple reverse titrations (black symbols) or via calculation using eq. 1, 2 and 4 and saltback data (red symbols) are plotted as a function of pH and salt concentration. Black solid lines represent linear least squares fits of combined reverse titration and saltback data (reported in Table 1). Green solid lines indicate the predicted dependence of logK_obs on [Na⁺] and pH using eq. 13 - 14 and parameters found by global nonlinear least squares analysis of all logK_obs vs [Na⁺] data (Table 2).