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What is the primary reason that NH3(aq) is added to the dissolved penny solution in this experiment? NH3 reacts with the NO2 produced by reaction

What is the primary reason that NH3(aq) is added to the dissolved penny solution in this experiment? NH3 reacts with the NO2 produced by reaction of the penny with HNO3. NH3 reacts with copper to form a colored complex. NH3 reacts with zinc to form a colored complex. NH3 neutralizes the HNO3 used to dissolve the penny

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