Adsorption of acetanilide on mercury from aqueous solutions of sodium dihydrogen phosphate

Abstract

The adsorption of acetanilide as a typical non-electrolyte has been studied from solutions of NaH₂PO₄. Its behaviour can be described by a two-dimensional equation of state of the imperfect gas type with a second virial coefficient equal to twice the molecular area. The standard free energy of adsorption depends quadratically on the effective charge on the metal, if the specifically adsorbed H₂PO^–₄ is allowed for in a simple way. The adsorption of H₂PO^–₄ ion has also been studied in the presence of acetanilide. The observed effects can be explained only in a tentative way.