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The average net valency of histidine as a function of pH in the bulk reservoir. We consider two different model salt solutions (as before we take B+ = 0 × 10−50 J m3) and two different concentrations: B− = 0 × 10−50 J m3 (circles), B− = −20 × 10−50 J m3 (squares), 0.1 M (solid symbol), and 0.5 M (open symbol). For comparison we have also added the corresponding curve when the surface pH is replaced with the bulk pH (shown as crosses).
