Viscosity The shear viscosities were computed using the OrthoBoXY approach and are presented in Figure . Several key trends emerge from our analysis. First, similar to the self-diffusion coefficients, the shear viscosity also follows an Arrhenius-like inverse temperature dependence, as demonstrated by the Arrhenius plot in Figure of the SI. This temperature behavior aligns well with classical expectations for liquid transport properties, where increasing thermal energy reduces intermolecular friction and enhances molecular mobility. Second, the viscosity exhibits a pronounced increase with rising salt concentration, spanning several orders of magnitude for different mixtures at the same temperature. Higher salt concentrations lead to stronger electrostatic interactions, hindering molecular rearrangement and increasing resistance to flow. Third, our computed viscosities are systematically slightly larger than the experimental data They are presented as star-shaped symbols with blue and orange colours for 303 K and 343 K, respectively.