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The goal of the present laboratory experiment is to deepen the understanding of the roles of additives in metal electrodeposition and some other concepts that are essential in electrochemistry. In this practical laboratory session, students first learn the blocking effect of additives on the deposition of metal by the potentials of the E-t curve. Second, the utilization of the Tafel curves to analyse the electrochemical activity of deposits is described. Finally, it is shown how and why the electrochemical activities of the deposits change with the Watts solution with and without additives. The experiment is completed in a 4-h laboratory period for pairs of students in physical chemistry lab class. This material is also suitable for an analytical chemistry lab class.

Understanding the Roles of Additives in Metal Electrodeposition: An Experiment for Undergraduate Physical Chemistry Students