A student proposes the following net ionic equation for the reaction that occurs when…

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Problem

A student proposes the following net ionic equation for the reaction that occurs when aqueous lead(II) nitrate is mixed with aqueous potassium iodide: Pb2+(aq)+2I−(aq)+2K+(aq)+NO3−(aq)→PbI2(aq)+2K+(aq)+NO3−(aq)Pb^{2+}(aq)+2I^-(aq)+2K^+(aq)+NO_3^-(aq)\rightarrow PbI_2(aq)+2K^+(aq)+NO_3^-(aq) Which option both identifies the principal error in the student’s equation and provides the corrected net ionic equation? (a) A nitrate ion is missing; the correct net ionic equation is Pb2+(aq)+2I−(aq)→PbI2(aq)Pb^{2+}(aq)+2I^-(aq)\rightarrow PbI_2(aq). (b) Potassium ions were not canceled; the correct net ionic equation is Pb2+(aq)+2I−(aq)+2K+(aq)→PbI2(s)+2K+(aq)Pb^{2+}(aq)+2I^-(aq)+2K^+(aq)\rightarrow PbI_2(s)+2K^+(aq). (c) The product phase is incorrect and spectator ions are present; the correct net ionic equation is Pb2+(aq)+2I−(aq)→PbI2(s)Pb^{2+}(aq)+2I^-(aq)\rightarrow PbI_2(s). (d) Only one iodide ion is needed; the correct net ionic equation is Pb2+(aq)+I−(aq)→PbI2(s)Pb^{2+}(aq)+I^-(aq)\rightarrow PbI_2(s).

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