Among all salts studied (Fig. and S8-12) we observe the largest difference in χ values for CaCl2 (Fig. ), for which the χ point estimates are ~1.5 times larger in magnitude for the reverse titration in the lower concentration regime. The magnitude of the potential, on the other hand, is smaller for the reverse titration, again in the lower concentration regime. We observe these effects are less pronounced for BaCl2 and SrCl2 (Fig. and). The MgSO4 reversibility manifests itself largely in the surface potential (Fig. ), while NaCl shows only very minor differences in interfacial structure and surface potential (Fig. ). Taken together, we find clear ion-specific outcomes on the structural and electrostatic hysteresis of our system for several of the salts we studied.