Msol ϵr ≈ 1 1400cm 3 /mol . In cases where the term linear in x in the denominator becomes noticeable, we can use a Taylor expansion of Equ. 18. If the linear term becomes important before the higher order interactions prevail, we would expect an additional contribution in ln γ ± which scales like x × x δ ln(x) = x 1+δ ln(x) which is a member of this family of functions with a different exponent. A similar argument holds for the concentration dependency of R 2 h . In conclusion, in our electrolyte picture the vivid discussion on how much the change in dielectric constant determines the change in ln γ ± is meaningless, since a change in dielectric constant and a higher order expansion are fully equivalent in our description.