Conductimetric titrations of acids and bases in benzene and dioxane

Acid-base tit rations were made conductimetrically in pure benzene and dioxan e with picric, t ri chloroacetic, and camphorsulfoni c acids, together with primary, secondary, and tertiary amines. Although the conductances of the solutions were extremely low, lower by a'factor of 10-8 or more tllan in water, t h e t itrations gave sharp end points which generally ,;ere accurate to 1 percent or better. The unusual , though similar behavior of all titrations involving trichloroacetic or camphorsulfonic acid, where the conductance of t h e salt was enhanced greatly by the presence of free acid, ,,as interpreted in term of a reaction between salt and acid leading to the formation o f a complex anion , The occasional variations in conductanc with ti me, in one instance suggesting slow attainment of some secondary ionic equilibrium, and the effect upon the t itrati o n c ur ves of the addition of a small amount o(me thYl a lcohol to the solvent are disc ussed .