Estudo teórico experimental da condutividade: soluções iônicas

Abstract

This paper presents a theoretical and experimental approach to the diffusion of ions and conductimetry of ionic solutions. The bases used related theory of mass transfer, diffusion, diffusion coefficient of ionic solutions and ionic conductimetry. Potassium acetate and tribasic sodium citrate salts at different temperatures (20, 25, 35 ° C) were used to study the mobility of ions. The results indicated a different electrical response that mean a distinct behavior of ions when in aqueous solutions of pure salts or mixtures. The study verify that the mixture of solutions and the temperature directly influenced the conductivity. For the temperature of 20 ºC the result of the sequence for the conductivity as a function of time was: 10% ethyl acetate - 90% citrate > 90% ethyl acetate -10% citrate > 50% citrate - 50% acetate > citrate > acetate; to a temperature of 25 ° C to approximately sequence is: citrate > acetate > 50% ethyl acetate - 50% citrate > 90% ethyl acetate - 10% citrate > 10% ethyl acetate - 90% citrate (up to ~ 10 min) and 35ºC conductivity versus time was the following: 10% ethyl acetate – 90% citrate > 50% citrate – 50% acetate > citrate > 90% acetate - 10% citrate > acetate. Moreover, the experimental data obtained were adjusted to the model proposed by Drude.