Studies on the sedimentation rates of cobalt II insoluble compounds show that the chromate and sulphide have higher sedimentation rates of 4.38 cm(3) min(-1) and 5.90 cm(3) min(-1) respectively while the cyanide had the lowest sedimentation rate of 0.230 cm(3) min(-1). The cyanide, chromate and sulphide show first order sedimntations while the carbonate and hydroxide show half order sedimentations. The sedimentation constant increases with increase in sedimentation tate. The carbonate had the lowest mass absorption coefficient of 0.014 cm(2) g(-1) while the chromate had the highest mass absorption coefficient of 0.071 cm(2) g(-1) and absorption coefficient has a linear dependence on the sedimentation rate.