Densities of water and solutions of sodium chloride and potassium chloride at the molalities (0.1, 0.5, and 1.0) mol kg(-1) were determined at 1 K temperature intervals from T = 277.15 K to T = 343.15 K. The densities were used in the evaluation of the apparent molar volumes, cubic expansion coefficients, the apparent molar expansibilities, and the second derivatives of the volume with respect to temperature. The results are discussed and compared with the literature data.