Effect of L-Arginine on Electrical Conductances of Aqueous Ionic Liquids 1-Alkyl-3-methylimidazolium Bromide Solutions at T = 298.15 K

Electrical conductances of aqueous ionic liquids, 1-propyl-3-methylimidazolium bromide, 1-butyl-3-methylimidazolium bromide, 1-pentyl-3-methylimidazolium bromide, 1-hexyl-3-methylimidazolium bromide solutions in dilute region in the presence of amino acid, L-arginine, have been measured at T = 298.15 K. The ion association constants, KA,limiting molar conductivities, 0 and distance parameters, R were obtained using lowconcentration Chemical Model (lcCM) conductivity equation for the investigated ionicliquids. The results show that the KA value and limiting molar conductivity, Λ0 decrease with and lengthening alkyl chain of ionic liquids. Therefore, there is slight ion association effect in [HMIm]Br. This can be attributed to the interaction of [RMIm]Br with the amino acids and increasing viscosity of mixture.