
Interpretation: The reason for jewelry to be often manufactured by plating an expensive metal needs to be explained.
Concept Introduction: An

Answer to Problem 42A
Jewelry is manufactured by plating an expensive metal like gold over a cheaper metal by electroplating to prevent corrosion.
Explanation of Solution
Electroplating is a process through which a metallic layer is coated on another metal by applying electric current. This is helpful to prevent corrosion or to produce an expensive metallic layer on a cheap metal.
The expensive metal act as anode and the metal which is plated acts as a cathode. The solution must contain ions of the desired plating material in the cell. On applying electric current, the reduction of ions takes place and it gets deposited on the metal taken as cathode.
Electroplating is simply the method coating one metal onto the other, primarily to avoid metal corrosion.
Chapter 18 Solutions
World of Chemistry, 3rd edition
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