---
title: "A student prepares an aqueous solution by dissolving equimolar quantities of solid magnesium chloride, \\(\\text{MgCl}_2\\text{(s)}\\), and solid sodium sulfate, \\(\\text{Na}_2\\text{SO}_4\\text{(s)}\\), in distilled water. The ionic charge and approximate ionic radius of each ion in the resulting solution are provided in the table below.  | Ion | Ionic charge | Ionic radius (\\(\\text{pm}\\)) | | :— | :— | :— | | \\(\\text{Mg}^{2+}\\) | \\(+2\\) | \\(72\\) | | \\(\\text{Na}^+\\) | \\(+1\\) | \\(102\\) | | \\(\\text{Cl}^-\\) | \\(-1\\) | \\(181\\) | | \\(\\text{SO}_4^{2-}\\) | \\(-2\\) | \\(230\\) |  When water molecules form hydration shells around the dissolved ions, which of the following species forms the strongest ion-dipole attraction with the oxygen atom of a water molecule?"
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url: "https://nerd-notes.com/ubq/119572/"
date_modified: "2026-08-21T06:53:54+00:00"
---

# A student prepares an aqueous solution by dissolving equimolar quantities of solid magnesium chloride, \(\text{MgCl}_2\text{(s)}\), and solid sodium sulfate, \(\text{Na}_2\text{SO}_4\text{(s)}\), in distilled water. The ionic charge and approximate ionic radius of each ion in the resulting solution are provided in the table below.

| Ion | Ionic charge | Ionic radius (\(\text{pm}\)) |
| :— | :— | :— |
| \(\text{Mg}^{2+}\) | \(+2\) | \(72\) |
| \(\text{Na}^+\) | \(+1\) | \(102\) |
| \(\text{Cl}^-\) | \(-1\) | \(181\) |
| \(\text{SO}_4^{2-}\) | \(-2\) | \(230\) |

When water molecules form hydration shells around the dissolved ions, which of the following species forms the strongest ion-dipole attraction with the oxygen atom of a water molecule?

A student prepares an aqueous solution by dissolving equimolar quantities of solid magnesium chloride, \(\text{MgCl}_2\text{(s)}\), and solid sodium sulfate, \(\text{Na}_2\text{SO}_4\text{(s)}\), in distilled water. The ionic charge and approximate ionic radius of each ion in the resulting solution are provided in the table below.

| Ion | Ionic charge | Ionic radius (\(\text{pm}\)) |
| :--- | :--- | :--- |
| \(\text{Mg}^{2+}\) | \(+2\) | \(72\) |
| \(\text{Na}^+\) | \(+1\) | \(102\) |
| \(\text{Cl}^-\) | \(-1\) | \(181\) |
| \(\text{SO}_4^{2-}\) | \(-2\) | \(230\) |

When water molecules form hydration shells around the dissolved ions, which of the following species forms the strongest ion-dipole attraction with the oxygen atom of a water molecule?

- **A.** \(\text{Na}^+\text{(aq)}\)
- **B.** \(\text{Cl}^-\text{(aq)}\)
- **C.** \(\text{Mg}^{2+}\text{(aq)}\)
- **D.** \(\text{SO}_4^{2-}\text{(aq)}\)

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/119572/*