Hard acids (Li+, Al³⁺, H+) prefer hard bases (F⁻, O²⁻); soft acids (Hg²⁺, Au+, Pt²⁺) prefer soft bases (I⁻, R₂S, PR₃). Rationalizes complex formation + solubility.
Hard acids (Li+, Al³⁺, H+) prefer hard bases (F⁻, O²⁻); soft acids (Hg²⁺, Au+, Pt²⁺) prefer soft bases (I⁻, R₂S, PR₃). Rationalizes complex formation + solubility.