Both, λ c and R h , depend on a parameter combination, that is concentration dependent. In the following, we will show, that for most typical electrolytes the concentration dependency is small. We will first focus on the factor ρ sol Msol ϵr . We approximate the dielectric constant as ideal combination of the real parts of the molar susceptibilities, χ s and χ w of the solute and water, respectively, in the solution: