Figure 2. Representative potentiometric titrations for the complexation of H₂A with Mn(II) at 25 °C(H₂A stands for the neutral glutarimidedioxime), I = 0.5 mol∙L⁻¹ NaCl, Initial solution: V = 26.0 mL, n_Mn²⁺ = 20.58 μmol, n_A²⁻ = 44.35 μmol, n_H⁺ = 88.48 μmol, Titrant: 63.55 mmol·L⁻¹ NaOH, Symbols: blue open circle – experimental data (−log[H⁺]), blue dashed line – fit (−log[H⁺]), solid lines – percentages of species relative to the total Mn(II) concentration (black: free Mn²⁺, red: MnHA⁺, pink: MnA₂²⁻).