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title: "A student investigates the crystallization of two ionic compounds using the solubility curves shown below. The student prepares two separate mixtures at \\(60\\ ^\\circ\\text{C}\\): in beaker 1, \\(40.0\\text{ g}\\) of \\(\\text{KNO}_3\\text{(s)}\\) is completely dissolved in \\(50.0\\text{ g}\\) of distilled water; in beaker 2, \\(20.0\\text{ g}\\) of \\(\\text{CuSO}_4\\text{(s)}\\) is completely dissolved in \\(50.0\\text{ g}\\) of distilled water.  Both beakers are cooled to \\(20\\ ^\\circ\\text{C}\\), and a tiny seed crystal is added to each to ensure that dynamic equilibrium between dissolved solute and solid precipitate is reached. Assuming no water evaporates, what mass of solid precipitates from each solution at \\(20\\ ^\\circ\\text{C}\\)?"
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url: "https://nerd-notes.com/ubq/123725/"
date_modified: "2026-09-28T12:02:11+00:00"
---

# A student investigates the crystallization of two ionic compounds using the solubility curves shown below. The student prepares two separate mixtures at \(60\ ^\circ\text{C}\): in beaker 1, \(40.0\text{ g}\) of \(\text{KNO}_3\text{(s)}\) is completely dissolved in \(50.0\text{ g}\) of distilled water; in beaker 2, \(20.0\text{ g}\) of \(\text{CuSO}_4\text{(s)}\) is completely dissolved in \(50.0\text{ g}\) of distilled water.

Both beakers are cooled to \(20\ ^\circ\text{C}\), and a tiny seed crystal is added to each to ensure that dynamic equilibrium between dissolved solute and solid precipitate is reached. Assuming no water evaporates, what mass of solid precipitates from each solution at \(20\ ^\circ\text{C}\)?

A student investigates the crystallization of two ionic compounds using the solubility curves shown below. The student prepares two separate mixtures at \(60\ ^\circ\text{C}\): in beaker 1, \(40.0\text{ g}\) of \(\text{KNO}_3\text{(s)}\) is completely dissolved in \(50.0\text{ g}\) of distilled water; in beaker 2, \(20.0\text{ g}\) of \(\text{CuSO}_4\text{(s)}\) is completely dissolved in \(50.0\text{ g}\) of distilled water.

Both beakers are cooled to \(20\ ^\circ\text{C}\), and a tiny seed crystal is added to each to ensure that dynamic equilibrium between dissolved solute and solid precipitate is reached. Assuming no water evaporates, what mass of solid precipitates from each solution at \(20\ ^\circ\text{C}\)?

- **A.** \(10.0\text{ g}\) of \(\text{KNO}_3\text{(s)}\) and \(0.0\text{ g}\) of \(\text{CuSO}_4\text{(s)}\)
- **B.** \(40.0\text{ g}\) of \(\text{KNO}_3\text{(s)}\) and \(10.0\text{ g}\) of \(\text{CuSO}_4\text{(s)}\)
- **C.** \(25.0\text{ g}\) of \(\text{KNO}_3\text{(s)}\) and \(10.0\text{ g}\) of \(\text{CuSO}_4\text{(s)}\)
- **D.** \(80.0\text{ g}\) of \(\text{KNO}_3\text{(s)}\) and \(20.0\text{ g}\) of \(\text{CuSO}_4\text{(s)}\)

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/123725/*