Investigation of the species formed on dissolving sodium tetrachloro-palladate(II) in glacial acetic acid

Abstract

Spectrophotometric investigation of the species formed when Na₂[PdCl₄] is dissolved in glacial acetic acid has shown that two principal equilibria, (i) and (ii), are set up. At 25 °C, K₀= 0.56 ± 0.02 and K′=(2.9 ± 0.6)× 2Na₂[PdCl₄] [graphic omitted] Na₂[Pd₂Cl₆]+ 2NaCl (i), Na₂[Pd₂Cl₆] [graphic omitted] Na[Pd₂Cl₅(HO₂CMe]+ NaCl (ii) 10^–5 mol dm^–3. Some evidence for equilibrium (iii) has been obtained, but the amount of Na[PdCl₃(HO₂CMe)] Na₂[PdCl₄] [graphic omitted] Na[PdCl₃(HO₂CMe)]+ NaCl (iii) present is so small that the standard deviation in the value of K″ is very high [K″=(3.5 ± 3.7)× 10^–4 mol dm^–3].