Two consecutive reactions are carried out in aqueous solution: 1

CHEMISTRY · Subjective · A Level · Chemistry · Amount of substance · Amount of substance

Problem

Two consecutive reactions are carried out in aqueous solution: 1. Pb2+(aq)+2 Cl−(aq)→PbCl2(s)\mathrm{Pb^{2+}(aq) + 2\,Cl^{-}(aq) \rightarrow PbCl_2(s)} 2. PbCl2(s)+2 I−(aq)→PbI2(s)+2 Cl−(aq)\mathrm{PbCl_2(s) + 2\,I^{-}(aq) \rightarrow PbI_2(s) + 2\,Cl^{-}(aq)} In one concise sentence, explain why Cl−\mathrm{Cl^{-}} does not appear in the overall net ionic equation for the combined process.

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