Mutual diffusion coefficients (interdiffusion coefficients) of cadmium (II) chloride in water at T = 310.15 K at concentrations between 0.001 mol.dm(-3) and 0.400 mol.dm(-3) have been determined, using the Taylor technique. The results are discussed on the basis of Nernst, and Onsager and Fuoss' theories, taking into account different phenomena such as electrophoretic and thermodynamic effects. Using such results, the equivalent conductance at infinitesimal concentration of the cadmium (II) ion in these solutions at T = 310.15 K has been estimated. These results permit us to have a better understanding of the structure of the cited systems and the thermodynamic behaviour of cadmium chloride in aqueous solutions. (C) 2012 Elsevier Ltd. All rights reserved.