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The number of bound Mg2+, Na+, and Cl− ions (νMg, νNa, and νCl ) for a mixed salt solution, with an ion radius of 1.4 Å and1:1 NaCl salt concentration fixed at 0.1 M, calculated with both the nonlinear Poisson-Boltzmann equation (Δ,□,o), and the size-modified Poisson-Boltzmann equation (×, ◇, +) are plotted as a function of MgCl2salt concentration ([MgCl2]). The NLPBE calculations were performed with a Stern layer of 1.4 Å thickness.
