Monodispersed chromium(III) hydroxide particles exchangeability of sulphate ions

Kinetics of ligand exchange between sulphate ions (present in the core of m onodispersed chromium hydroxide particles in the form of chromium basic sul phate) and hydroxyl ions has been studied. In addition, the effect of pH on the extent of this exchange has been investigated. Preliminary results sho wed that the rate of exchange is relatively high and substantially exceeds the rate for water exchange described in the literature for soluble [Cr(H2O )(6)](3+) species. This observation contradicts the suggestion by some auth ors(1) that the rate of SO42-/OH- ligand exchange at the solid/liquid inter face is very slow.