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A diagram illustrating Lewis acid–base interaction, or acid–base stability energies in term of α*ΔG°f,Mn+ vs ΔG°f,Mn+ plot. The proton (H+) is at the unique position of the origin. The softness of a base (ligand) is gauged with the slope of α*ΔG°f,Mn+ vs ΔG°f,Mn+ with a positive slope for a soft base. A positive α*ΔG°f,Mn+ value indicates a preferential complexation between the acid and the base.
