Velocity correlations in aqueous electrolyte solutions from diffusion, conductance and transference data. Application to concentrated solutions of cadmium iodide
Abstract
Tracer-diffusion coefficients for the Cd and I constituents and of water in aqueous CdI2 solutions have been measured up to concentrations of ca. 2 mol dm–3 at 298.16 K. In conjunction with other transport thermodynamic data, these measured values have been used to calculate velocity cross-correlation coefficients for the CdI2/H2O system. Trends in these coefficients due to complex formation are examined and discussed. Anomalously high mobilities for negative complexes of cadmium are needed to explain the observation of negative transference numbers.