Eutectic mixtures of quaternary ammonium salts with Lewis or Br
nsted acids have been described as ionicliquid, but doubt exists over the com
positional range for which this descri
ption is valid. In the current work,the conductivity, viscosity, density, and surface tension of a number of glycolic mixtures with choline chlorideare measured over the mole fraction range 0 to 0.33. The data are fitted to hole theory, and it is
pro
posed thatthe com
position at which the measured conductivity matches the theoretical value is the
point at which holemobility becomes the dominant mechanism for charge mobility. For the mixtures of ethylene glycol andbutanediol, this occurs at a ChCl mole fraction of a
pproximately 0.2.