Structural features of solvation complexes of K+ and Br- ions in H2O and D2O

The densities of KBr solutions in H2O and D2O were measured at temperatures 278.15-318.15 K with an interval of 10 K in a wide concentration range by a precision densimeter with a magnetic float, with an error of no more than +/-(1 x 10(-5)) g cm(-3). The limiting partial molar volumes and limiting partial molar expansions of KBr and excess molar volumes of solutions were calculated. Hydrogen bonding, which gives water its structural features, ap pears to play a decisive role in the formation of hydration complexes. At 3 00 K, a stoichiometric K+-Br- mixture has roughly the same effect on the st ructures of H2O and D2O.