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The reaction that occurs is a redox reaction. The Copper metal (Cu 0)on the copper pennies is oxidized in concentrated nitric acid to produce Cu 2 + ions. Copper is easily oxidized to Cu 2 +, which is blue in aqueous solutions (water) so you should see the solution turn blue as the copper penny reacts.he Copper metal (Cu 0)on the copper pennies is oxidized in concentrated nitric acid to produce Cu 2 + ions. Copper is easily oxidized to Cu 2 +, which is blue in aqueous solutions (water) so you should see the solution turn blue as the copper penny reacts.
Reactions using chlorides or nitrates can also be used. The order of the metals in the reactivity series. can be worked out by using these type of reactions. For example, tin would be seen to displace lead from lead chloride. but would not react with iron(II) chloride. tin + lead chloride tin chloride + lead.