The densities and isobaric volumetric heat capacities of aqueous solutions of the sulfate salts of cobalt(II), nickel(II), and copper(II) have been measured at 298.15 K and 0.1 MPa using vibrating-tube densimetry and Picker flow calorimetry, respectively, at concentrations in the range 0.01 8 m/mol.kg(-1) 8 1.5. These data were used to derive the corresponding apparent molar volumes, V-phi, and apparent molar isobaric heat capacities, C-p phi. Where comparisons were possible, the present V-phi results were in good agreement with literature data. No C-pf data appear to have been reported previously for any of these salts. The variations of V-f and C-p phi with concentration were well correlated using the Pitzer formalism combined with the values of V degrees and Cp degrees estimated from literature data. Both V-phi and C-p phi for all three salts show remarkable similarities and can be shown to lie on a common line by applying fixed addends over almost the whole concentration range studied.