Comments and Protocols for the Construction and Calibration of Ag AgCl Reference Electrodes

Authors: Torriero AAJ*

DOI: 10.23880/ijbp-16000219

Volume 8, Issue 1

Abstract

Despite the vital importance of reference electrodes, RE, it is common for PhD students in electrochemistry and other users of electrochemical instruments to lack a thorough understanding of their creation and calibration. This work presents the protocol to construct Ag/AgCl RE with different NaCl concentrations. The experimental RE potentials are measured using two techniques and compared to those obtained using the Nernst equation. The RE potential similarities or differences observed when different NaCl concentrations are present are also discussed. Furthermore, using an electrolytic cell to deposit AgCl onto the silver wire part of the RE and determining the mass of AgCl formed using Faraday’s law of electrolysis are presented. These reference electrodes are easily constructed, and the materials needed are readily available and non-toxic. Furthermore, the reference electrodes exhibit good potential stability as a function of time.

Keywords: Electrodes; Protocol to Construct Ag/AgCl RE; NaCl; Faraday’s Law; Potential-Controlled

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