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.