Interpretation: The reason for use of direct current and not alternating current in the electroplating of metals needs to be explained.
Concept Introduction: In a
Explanation of Solution
In the electroplating of metals, two reactions that are oxidation and reduction take place. Here, the plating of a metal onto the other takes place to prevent corrosion. In this process, the first metal from the anode is dissolved and plated onto the cathode. Here, oxidation takes place at the anode resulting oxidizing and dissolving of metal in the electrolyte solution. At the cathode, the metal ions (dissolved metal) get reduced to solid metal and plated on the desired metal. Here, direct current is used as it flows only in one direction. If an alternating current is used for the process, the reactions occurring at the anode and cathode would reverse constantly and the electroplating process cannot be completed.
Chapter 21 Solutions
Chemistry 2012 Student Edition (hard Cover) Grade 11
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