A fast and Simple Way for the Determination of Avogadro Number and Faraday Constant

Abstract

In an illuminating experiment suitable for the first grade undergraduate and high school students, we tried to determine the Avogadro number considering accuracy and time. A voltage of 2.54 volt was applied to the circuit by immersing two zinc plate electrodes in ZnSO4.7H2O solution of 0,1M. When this voltage was applied, there was a current of 0,140 Amp in the circuit. The Avogadro number was evaluated, with an error of ± 0,07, by weighting the mass increase in the cathode at the end of a 1200-minute time period. Pedagogically, this activity interrelates the studies of electrochemistry and electrolysis in an efficient laboratory activity.