The thermodynamics of silver-halide-water systems are summarized in the form of potential-pH and activity-pH diagrams, calculated from recently published standard Gibbs energies of formation of the various species and phases considered. Stabilities and hence solubilities of Ag(I) halide species are predicted to increase in the order Cl < Br < 1, which is reflected in the corresponding potential-pH diagrams by a decreasing potential for the AgX(c)/Ag and AgX(n)(n-1)-/Ag couples, and a transition from solid phase to solution complex predominance with increasing free halide activities.k