MIXTURE DENSITIES OF AQUEOUS KCL WITH NACL UP TO IONIC-STRENGTH 4.5 MOL KG-1 AND AT 298.15-K

The experimental density differences, DELTA d, are reported for aqueous mixtures of KCl with NaCl at 298. 15 K from the constant ionic strength, I, 0. 5-4. 5 mol kg** minus **1 of water. The results are fitted to the equations derived by Patwardhan and Kumar (equivalent to Young's rule) and by Pitzer. The interactions between Na** plus and K** plus , as shown by the excess volumes, DELTA V//m, are very small.