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AP Chemistry
4.5 Stoichiometry
4.3 Representations of Reactions
4.2 Net Ionic Equations
AdvancedMCQDrawing RepresentationsConceptual18.9k
A rectangular container representing an aqueous mixture before reaction. A legend to the right defines four symbols: a solid black circle represents \(\text{Pb}^{2+}\), an open square represents \(\text{I}^-\), a small open circle represents \(\text{K}^+\), and a small gray circle represents \(\text{NO}_3^-\). Inside the container, the following ions are dispersed throughout the liquid volume: exactly 3 solid black circles, exactly 4 open squares, exactly 4 small open circles, and exactly 6 small gray circles. No solid precipitate is present at the bottom of the container. No other particles, labels, text, or annotations appear.
Particulate representation of the aqueous mixture prior to reaction.
A student mixes aqueous solutions of lead(II) nitrate, \(\text{Pb(NO}_3)_2\text{(aq)}\), and potassium iodide, \(\text{KI(aq)}\). A precipitate of lead(II) iodide, \(\text{PbI}_2\text{(s)}\), forms according to the balanced net ionic equation below.

\[\text{Pb}^{2+}\text{(aq)} + 2\,\text{I}^-\text{(aq)} \rightarrow \text{PbI}_2\text{(s)}\]

The diagram below represents the aqueous mixture immediately upon mixing but before any reaction occurs, containing \(3\) \(\text{Pb}^{2+}\) ions, \(4\) \(\text{I}^-\text{)}\) ions, \(4\) \(\text{K}^+\) ions, and \(6\) \(\text{NO}_3^-\) ions (solvent water molecules are omitted for clarity). Assuming the reaction proceeds to completion, which of the following particulate diagrams best represents the contents of the container at the end of the reaction?

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