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-methylimidazoliumbromide, 1-butyl-3-methylimidazolium bromide, 1-pentyl-3-methylimidazolium bromide,1-hexyl-3-methylimidazolium bromide solutions in dilute region in the presence of aminoacid, 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, ?0 decrease withincreasing l-arginine concentration 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.