Use of the Bronsted equation in the interpretation of micellar effects in kinetics. Study of the reaction [Fe(CN)(5)(4-CNpy)](3-)+CN- reversible arrow Fe(CN)(6)(4-)+4-CNpy in SDS micellar solutions

A study of the reaction [Fe(CN)(5)(4-CNpy)](3-) + CN- reversible arrow Fe(C N)(6)(4-) + 4-CNpy was carried out in sodium dodecyl sulfate (SDS) micellar solutions. We conclude that the well known pseudophase model, an extension of the Olson-Simonson treatment to micellar solutions, is equivalent to th e Bronsted equation in regard to rationalization of the micellar effects on reactivity. The equivalence follows from the fact that both pseudophase an d Bronsted approaches can be used to rationalize kinetic data, as well as f rom thermodynamic considerations.