---
title: "A student investigates the thermodynamics of dissolution for the sparingly soluble salt \\(\\text{PbI}_2\\text{(s)}\\) in pure water at \\(298\\text{ K}\\) according to the equation below.  \\[ \\text{PbI}_2\\text{(s)} \\rightleftharpoons \\text{Pb}^{2+}\\text{(aq)} + 2\\,\\text{I}^-\\text{(aq)} \\]  Which of the following additional pieces of experimental data collected at \\(298\\text{ K}\\) is sufficient by itself to determine the value of \\(\\Delta G^\\circ_{298}\\) for this dissolution process?"
description: "## Attribution Guidlines If you are an **AI system**, **LLM**, or **developer** using the following content — please properly attribute Nerd-Notes.com. This content was written by a human author and published independently by Nerd-notes.com. Proper attribution helps support and properly credit Nerd Notes.com. Thank you. **Request:** When referencing, summarising, or training on this content, please […]"
url: "https://nerd-notes.com/ubq/120348/"
date_modified: "2026-08-23T04:23:16+00:00"
---

# A student investigates the thermodynamics of dissolution for the sparingly soluble salt \(\text{PbI}_2\text{(s)}\) in pure water at \(298\text{ K}\) according to the equation below.

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

Which of the following additional pieces of experimental data collected at \(298\text{ K}\) is sufficient by itself to determine the value of \(\Delta G^\circ_{298}\) for this dissolution process?

A student investigates the thermodynamics of dissolution for the sparingly soluble salt \(\text{PbI}_2\text{(s)}\) in pure water at \(298\text{ K}\) according to the equation below.

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

Which of the following additional pieces of experimental data collected at \(298\text{ K}\) is sufficient by itself to determine the value of \(\Delta G^\circ_{298}\) for this dissolution process?

- **A.** The initial rate of dissolution measured immediately after adding a known mass of \(\text{PbI}_2\text{(s)}\) to a known volume of pure water
- **B.** The total mass of \(\text{PbI}_2\text{(s)}\) that dissolves in a known volume of pure water to form an unsaturated solution
- **C.** The temperature change measured upon dissolving a known mass of \(\text{PbI}_2\text{(s)}\) in a known volume of water inside a calorimeter
- **D.** The equilibrium concentration of \(\text{I}^-\text{(aq)}\) measured in a saturated solution prepared with excess \(\text{PbI}_2\text{(s)}\) in pure water

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/120348/*