Schulze–Hardy rule
The generalization that the critical @[email protected] concentration for a typical @[email protected] is extremely sensitive to the @[email protected] of the @[email protected] (high @[email protected] gives a low critical @[email protected] concentration).
PAC, 1972, 31, 577. (Manual of Symbols and Terminology for Physicochemical Quantities and Units, Appendix II: Definitions, Terminology and Symbols in Colloid and Surface Chemistry) on page 610 [Terms] [Paper]