---
title: "A student prepares two separate aqueous mixtures at \\(25\\text{ }^\\circ\\text{C}\\).  Mixture 1 is prepared by combining \\(50.0\\text{ mL}\\) of \\(0.10\\text{ M }\\text{CH}_3\\text{COOH(aq)}\\) with \\(50.0\\text{ mL}\\) of \\(0.10\\text{ M }\\text{NaOH(aq)}\\).  Mixture 2 is prepared by combining \\(50.0\\text{ mL}\\) of \\(0.10\\text{ M }\\text{NH}_3\\text{(aq)}\\) with \\(50.0\\text{ mL}\\) of \\(0.10\\text{ M }\\text{HCl(aq)}\\).  Which of the following correctly predicts and explains the \\(\\text{pH}\\) of each mixture at \\(25\\text{ }^\\circ\\text{C}\\)?"
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url: "https://nerd-notes.com/ubq/119740/"
date_modified: "2026-08-21T08:12:11+00:00"
---

# A student prepares two separate aqueous mixtures at \(25\text{ }^\circ\text{C}\).

Mixture 1 is prepared by combining \(50.0\text{ mL}\) of \(0.10\text{ M }\text{CH}_3\text{COOH(aq)}\) with \(50.0\text{ mL}\) of \(0.10\text{ M }\text{NaOH(aq)}\).

Mixture 2 is prepared by combining \(50.0\text{ mL}\) of \(0.10\text{ M }\text{NH}_3\text{(aq)}\) with \(50.0\text{ mL}\) of \(0.10\text{ M }\text{HCl(aq)}\).

Which of the following correctly predicts and explains the \(\text{pH}\) of each mixture at \(25\text{ }^\circ\text{C}\)?

A student prepares two separate aqueous mixtures at \(25\text{ }^\circ\text{C}\).

Mixture 1 is prepared by combining \(50.0\text{ mL}\) of \(0.10\text{ M }\text{CH}_3\text{COOH(aq)}\) with \(50.0\text{ mL}\) of \(0.10\text{ M }\text{NaOH(aq)}\).

Mixture 2 is prepared by combining \(50.0\text{ mL}\) of \(0.10\text{ M }\text{NH}_3\text{(aq)}\) with \(50.0\text{ mL}\) of \(0.10\text{ M }\text{HCl(aq)}\).

Which of the following correctly predicts and explains the \(\text{pH}\) of each mixture at \(25\text{ }^\circ\text{C}\)?

- **A.** \(\text{pH} > 7\) for Mixture 1 because \(\text{CH}_3\text{COO}^-\text{(aq)}\) hydrolyzes to produce \(\text{OH}^-\text{(aq)}\), and \(\text{pH} < 7\) for Mixture 2 because \(\text{NH}_4^+\text{(aq)}\) hydrolyzes to produce \(\text{H}_3\text{O}^+\text{(aq)}\).
- **B.** \(\text{pH} < 7\) for Mixture 1 because \(\text{CH}_3\text{COOH(aq)}\) is a weak acid, and \(\text{pH} > 7\) for Mixture 2 because \(\text{NH}_3\text{(aq)}\) is a weak base.
- **C.** \(\text{pH} = 7\) for both Mixture 1 and Mixture 2 because equal moles of acid and base are mixed, resulting in complete neutralization.
- **D.** \(\text{pH} > 7\) for both Mixture 1 and Mixture 2 because spectator ions from the strong reactants increase the hydroxide ion concentration in aqueous solution.

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/119740/*