Chloroaluminate Equilibria in the Aluminum Chloride‐1‐Methyl‐3‐ethylimidazolium Chloride Ionic Liquid

The stoichiometric equilibrium constant, , for the autosolvolysis reaction for the aluminum chloride‐1‐methyl‐3‐ethylimidazolium chloride ionic liquid was investigated as a function of temperature with a chloroaluminate concentration cell and aluminum electrodes. The values obtained at 40°, 50°, and 60°C for were , , and. The enthalpy change for the autosolvolysis reaction was found to be approximately 80 kJ · mol⁻¹ over this temperature range. A curve fitting method for determining the initial composition of this ionic liquid during a titration is also described.