[OTF] the maxima showed at xIL,max=0.3. This behavior also results from the competitive nature of viscous forces and the type and size of the ions in the RTIL system. Figure ) and Figure (c) (supporting information) show the RTIL viscosity and relative mobility of cation in this RTIL system. Among imidazolium and pyrrolidinium-based [OTF] -anion RTIL system, [EMIM][OTF] has the maximum ion mobility, which could be the result of the lowest viscosity which represents that it has enough lowest viscosity, showing increasing relative mobility of cation resulting maximum conductivity. In addition, Figure (c) (supporting information) shows a similar relative ion dissociation behavior with the ionic conductivity with previously discussed RTIL systems. Relative ion dissociation similarly represents the conductivity behavior pattern with composition, making it a significant parameter to define the ionic conductivity dependency with the composition of the RTILs (Figure ). However, this RTIL system showed almost similar composition for representing maximum ionic conductivity (Figure ). Figure ). In addition, Figure (d) (supporting information) represents the behavior of ionic conductivity of RTIL and ξr, and this represents that relative ion dissociation follows the trend of the increasing conductivity then reaching to maximum and then decreasing to the minimum. Therefore, these phenomena explain the conductivity behavior of this RTIL system in EG. [DCA] has as the conflict behavior of the ξr profile to be compared with the ionic conductivity profile with composition, which could be the result of the competitive behavior of the viscous forces, structure of the anion and cation, and property of the EG. However, the ξr profile follows the trend of getting maxima for both the RTIL, as well as the ionic conductivity profile for ξr follows a similar behavior to other RTILs (Figure (e) (supporting information)). Similarly, another RTIL system was also used to study the ionic conductivity behavior in EG. These RTIL systems are