for the l th order contribution to the osmotic coefficient. Here, B x B (1 + λ l , 0) is the incomplete Euler Beta function and Φ(x B , 2, 1 + λ l ) is the Lerch transcendent. These analytical descriptions (Equs. 3 and 6) allow a direct global fit of experimental values of electrolyte activity, osmotic coefficient and water activity and, therefore, simplify the retrieval of excess thermodynamic properties using different measurement techniques. Figures and show example fits for LiCl and ZnCl 2 together with their fit residuals (insets). Please note, that the oscillatory behavior in the residuals is an artifact, since the published data have been fitted by a combination of Debye-Hückel, Pitzer and polynomial terms. In case of ZnCl 2 Goldberg required 13 and 8 coefficients to reproduce ln γ ± and the osmotic coefficient, respectively, while we require a total of seven identical fit parameters with a clear physical meaning (σ ln γ ± = 0.00983 and σ φ = 0.00589 vs. σ ln γ ± = 0.00747 and σ φ = 0.00684 in the work be Goldberg) for both physical properties.