This dataset contains experimental results on the simultaneous transport of EDTA species and hydroxyl ions through an anion-exchange membrane during electrodialysis under alkaline conditions. Chronopotentiometric measurements and current–voltage curves were obtained using solutions at different pH values and electrolyte concentrations. Speciation diagrams are also present. The dataset is suitable for studies on pH-dependent ion transport, the use of complexing agents in electrodialysis, and electrochemical diagnostics of anion-exchange membranes. The data used to generate the figures are provided in the corresponding Excel worksheets. Each dataset is specified below. Figure 4a: Chronopotentiograms registered for solutions with EDTA in 1.5 × 10−3 mol·L−1 at pH 9. Figure 4b: Chronopotentiograms registered for solutions with EDTA in 1.5 × 10−3 mol·L−1 at pH 10. Figure 4c: Chronopotentiograms registered for solutions with EDTA in 1.5 × 10−3 mol·L−1 at pH 11. Figure 4d: Chronopotentiograms registered for solutions with EDTA in 1.5 × 10−3 mol·L−1 at pH 12. Figure 4e: Derivative of the membrane potential drop with respect to time obtained for the solutions at pH 9 and 10. Figure 4f: Derivative of the membrane potential drop with respect to time obtained for the solutions at pH 11 and 12. Figure 5: Speciation diagrams shown as (a) log [C] and (b) fraction of ionic species versus pH constructed for 1.5 × 10−3 mol·L−1 EDTA solution. Figure 7: Current-voltage curves constructed for 1.5 × 10−3 mol·L−1 EDTA solution at pH (a) 9, (b) 10, (c) 11, and (d) 12. Figure 8a:Chronopotentiograms constructed for solutions at pH 11 and EDTA concentration of 1.5 × 10−4 mol·L−1. Figure 8b: Chronopotentiograms constructed for solutions at pH 11 and EDTA concentration of 1.5 × 10−2 mol·L−1. Figure 8c: Derivative of the membrane potential drop with respect to time obtained for EDTA solutions at 1.5 × 10−4 mol·L−1 and 1.5 × 10−2 mol·L−1. Figure 9: Speciation diagram constructed for the solution at EDTA concentration of (a) 1.5 × 10−4 mol·L−1 and (b) 1.5 × 10−2 mol·L−1. pH 11. Figure 10: Dependence of iτ1/2 on current density for the EDTA solutions in 1.5 × 10−4 mol·L−1 and 1.5 × 10−2 mol·L−1. Figure 11: Current-voltage curves constructed for solutions at pH 11 and EDTA concentration of (a) 1.5 × 10−4 mol·L−1 and (b) 1.5 × 10−2 mol·L−1.