---
title: "A student performs three separate chemical procedures in the laboratory and records the balanced net ionic equations shown in the table below.  | Reaction | Chemical equation | | :— | :— | | 1 | \\(\\text{Ba}^{2+}\\text{(aq)} + \\text{SO}_4^{2-}\\text{(aq)} \\rightarrow \\text{BaSO}_4\\text{(s)}\\) | | 2 | \\(\\text{H}_2\\text{PO}_4^-\\text{(aq)} + \\text{NH}_3\\text{(aq)} \\rightleftharpoons \\text{HPO}_4^{2-}\\text{(aq)} + \\text{NH}_4^+\\text{(aq)}\\) | | 3 | \\(\\text{ClO}^-\\text{(aq)} + 2\\,\\text{I}^-\\text{(aq)} + 2\\,\\text{H}^+\\text{(aq)} \\rightarrow \\text{Cl}^-\\text{(aq)} + \\text{I}_2\\text{(aq)} + \\text{H}_2\\text{O(l)}\\) |  Which of the following correctly identifies the role of a species in one of the reactions?"
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url: "https://nerd-notes.com/ubq/121478/"
date_modified: "2026-08-23T05:04:47+00:00"
---

# A student performs three separate chemical procedures in the laboratory and records the balanced net ionic equations shown in the table below.

| Reaction | Chemical equation |
| :— | :— |
| 1 | \(\text{Ba}^{2+}\text{(aq)} + \text{SO}_4^{2-}\text{(aq)} \rightarrow \text{BaSO}_4\text{(s)}\) |
| 2 | \(\text{H}_2\text{PO}_4^-\text{(aq)} + \text{NH}_3\text{(aq)} \rightleftharpoons \text{HPO}_4^{2-}\text{(aq)} + \text{NH}_4^+\text{(aq)}\) |
| 3 | \(\text{ClO}^-\text{(aq)} + 2\,\text{I}^-\text{(aq)} + 2\,\text{H}^+\text{(aq)} \rightarrow \text{Cl}^-\text{(aq)} + \text{I}_2\text{(aq)} + \text{H}_2\text{O(l)}\) |

Which of the following correctly identifies the role of a species in one of the reactions?

A student performs three separate chemical procedures in the laboratory and records the balanced net ionic equations shown in the table below.

| Reaction | Chemical equation |
| :--- | :--- |
| 1 | \(\text{Ba}^{2+}\text{(aq)} + \text{SO}_4^{2-}\text{(aq)} \rightarrow \text{BaSO}_4\text{(s)}\) |
| 2 | \(\text{H}_2\text{PO}_4^-\text{(aq)} + \text{NH}_3\text{(aq)} \rightleftharpoons \text{HPO}_4^{2-}\text{(aq)} + \text{NH}_4^+\text{(aq)}\) |
| 3 | \(\text{ClO}^-\text{(aq)} + 2\,\text{I}^-\text{(aq)} + 2\,\text{H}^+\text{(aq)} \rightarrow \text{Cl}^-\text{(aq)} + \text{I}_2\text{(aq)} + \text{H}_2\text{O(l)}\) |

Which of the following correctly identifies the role of a species in one of the reactions?

- **A.** In Reaction 1, \(\text{SO}_4^{2-}\text{(aq)}\) acts as a reducing agent because its net ionic charge increases from \(-2\) to \(0\) in \(\text{BaSO}_4\text{(s)}\).
- **B.** In Reaction 3, \(\text{I}^-\text{(aq)}\) acts as a reducing agent because the oxidation state of iodine increases from \(-1\) to \(0\).
- **C.** In Reaction 2, \(\text{NH}_3\text{(aq)}\) acts as a Brønsted-Lowry acid because it accepts a proton from \(\text{H}_2\text{PO}_4^-\text{(aq)}\).
- **D.** In Reaction 3, \(\text{ClO}^-\text{(aq)}\) acts as a reducing agent because the oxidation state of chlorine decreases from \(+1\) to \(-1\).

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/121478/*