---
title: "A student combines \\(100.0 \\, \\text{mL}\\) of \\(0.10 \\, \\text{M} \\, \\text{Pb(NO}_3\\text{)}_2(\\text{aq})\\) with \\(100.0 \\, \\text{mL}\\) of \\(0.10 \\, \\text{M} \\, \\text{KI}(\\text{aq})\\) at \\(25^\\circ\\text{C}\\), causing a yellow precipitate of \\(\\text{PbI}_2(\\text{s})\\) to form. Which of the following predictions correctly ranks the molar concentrations of the ions remaining in the solution from highest to lowest after the reaction goes to completion?"
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url: "https://nerd-notes.com/ubq/119261/"
date_modified: "2026-08-21T06:28:52+00:00"
---

# A student combines \(100.0 \, \text{mL}\) of \(0.10 \, \text{M} \, \text{Pb(NO}_3\text{)}_2(\text{aq})\) with \(100.0 \, \text{mL}\) of \(0.10 \, \text{M} \, \text{KI}(\text{aq})\) at \(25^\circ\text{C}\), causing a yellow precipitate of \(\text{PbI}_2(\text{s})\) to form. Which of the following predictions correctly ranks the molar concentrations of the ions remaining in the solution from highest to lowest after the reaction goes to completion?

A student combines \(100.0 \, \text{mL}\) of \(0.10 \, \text{M} \, \text{Pb(NO}_3\text{)}_2(\text{aq})\) with \(100.0 \, \text{mL}\) of \(0.10 \, \text{M} \, \text{KI}(\text{aq})\) at \(25^\circ\text{C}\), causing a yellow precipitate of \(\text{PbI}_2(\text{s})\) to form. Which of the following predictions correctly ranks the molar concentrations of the ions remaining in the solution from highest to lowest after the reaction goes to completion?

- **A.** \([\text{NO}_3^-] > [\text{K}^+] = [\text{Pb}^{2+}] > [\text{I}^-]\)
- **B.** \([\text{NO}_3^-] > [\text{Pb}^{2+}] > [\text{K}^+] > [\text{I}^-]\)
- **C.** \([\text{NO}_3^-] > [\text{K}^+] > [\text{Pb}^{2+}] > [\text{I}^-]\)
- **D.** \([\text{K}^+] > [\text{NO}_3^-] > [\text{Pb}^{2+}] > [\text{I}^-]\)

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/119261/*