Conductivity of the Liquid System Water + Acetic Acid + Silver Acetate

Abstract

We present and discuss experim ental values o f the electric conductivity (and o f the density) for the liquid ternary system water + acetic acid + silver acetate at 25 °C. The results given here represent a selection from measurem ents on more than 200 com positions. The concepts o f equivalent condu ctivity and o f limitir.g values for infinite dilution in the ternary system are also dealt w ith briefly.We w ant to present an d to discuss th e results of m easurem ents of th e electric conductivity (and of th e density) of th e te rn a ry liquid system w ater -facetic acid + silver acetate a t 25 °C. Since our experim ents were carried out for m ore th a n I f we stipulate th a t th e only charged species present are H +, Ag+, and Ac-, we find for th e conductivity y. : where Z( denotes th e charge n um ber of ionic species i, Ci its concentration, A* its ionic con d u ctiv ity (product of F a ra d a y co n stan t an d m obility, w ater being th e reference substance), an d < X 2 or 0C 3 th e degree of dissociation of acetic acid (concentration C2 ) or of silver acetate (concentra tion C3 ), respectively. Defining an "equivalent co n d u ctiv ity " A byintroducing th e " equivalent fractions" X 2 and X 3 of acetic acid and silver acetate Aac -(x-2 X 2 + 0C 3 X 3 ) Aac~ (4) we derive from Eq. (1):The quantities A h , and Aac m ay be called the ionic conductivities of the ion constituents H, Ag, and Ac.In Table 1 we present a selection from our experim ental values of th e density (required for th e com putation of concentrations from mass fractions), of the conductivity, and of th e equivalent conduc tiv ity . Our m easurem ents cover th e range betw een infinite dilution and C2 = 0,5mol/1, C3 = 0,05mol/1 a t 25 °C. The d a ta include values for th e binary system s w ater -j-acetic acid (C3 = 0 ) and w ater + silver acetate (c2 = 0 ).