Hypothesis: Which plating method did the counterfeiters use to make their coins?
They used ADDITIVE PLATING to create a redox reaction between zinc solid and zinc ions. This
created neutral zinc atoms that were plated onto the copper coins.
They used DISPLACEMENT PLATING to create a redox reaction between neutral copper and zinc ions.
Electrons from copper are transferred to zinc ions, creating copper ions. The copper metal atoms are
then displaced with zinc.

They used Additive plating to create a redox reaction between zinc solid and zinc ions. This created neutral zinc atoms that were plated onto the copper coins.

Electroplating is a method of coating a metal on top of another metal. This is usually done for ornamental purposes, for the production of coins or for industrial purposes.

The coating of a metal can be achieved in two ways;

Additive plating

Displacement plating

In additive plating, metal ions are reduced by a specie in solution that donates electrons. The reduced metal now deposits on the surface of another metal.

In displacement plating, a metal with lower oxidation number is displaces a metal of higher oxidation number when the solution contains the plating metal.

For counterfeiters, the only way to produce counterfeit coins is by the use of additive plating where the counterfeiters coated the coinage metal on top of another base metal.

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