Ion transport models are compared by simulating the limiting current density of copper deposition from aqueous CuSO4 solutions on a rotating disk electrode. The first ion transport model is the pseudoideal solution model. on which many commercial electroanalytical simulation tools are built. The second, more rigorous model consists of the linear phenomenological equations for which the activity coefficients and Onsager coefficients are calculated locally with the mean spherical approximation (MSA). The influence of the formal association constant in the pseudoideal Solution model is also investigated.