An explicit method for uncertainty estimation associated with excess partial molar properties at infinite dilution calculated using standard uncertainties of Redlich-Kister parameters, fitted to data over the whole composition range, is presented for the first time. The application of this method to sets of accurate volumetric experimental data for aqueous water + ethanol binary mixtures, experimentally determined by different authors is made and the results are compared. A refinement of this method is also presented when, in very-diluted regions, Redlich-Kister lines deviate from experimental points more than their standard uncertainties. The procedure of uncertainty calculation is based on the Guide to the Expression of Uncertainty in Measurements (GUM). (C) 2010 Elsevier B.V. All rights reserved.