A piece of copper metal was added to an aqueous solution of silver nitrate, and within a few minutes it was observed that a grey crystalline solid formed on surface of the copper. The solution turned a blue color characteristic of copper(II) ions. Select the correct net ionic equation for this reaction. A) Cu(s) + Ag⁺(aq) $\rarr$ Cu²⁺(aq) + Ag(s) B) Cu(s) + 2Ag⁺(aq) $\rarr$ Cu²⁺(aq) + 2Ag(s) C) Cu(aq) + 2Ag⁺(aq) $\rarr$ Cu²⁺(aq) + 2Ag(aq) D) 2Cu(s) + Ag⁺(aq) $\rarr$ 2Cu²⁺(aq) + Ag(s) E) None of the above

Question

Quizplus · Accepted Answer

The initial reaction is: 
Cu(s) + 2AgNO3(aq) -> Cu(NO3)2(aq) + 2Ag(s)
The net ionic equation is obtained by only showing the species that are directly involved in the reaction:
Cu(s) + 2Ag+(aq) -> Cu2+(aq) + 2Ag(s)
The grey crystalline solid that formed on the surface of the copper is likely Cu2O, which is not included in any of the answer choices.

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