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title: "A student titrates a \\(25.0\\text{ mL}\\) sample of \\(0.10\\text{ M}\\ \\text{NH}_3\\text{(aq)}\\) with \\(0.10\\text{ M}\\ \\text{HCl(aq)}\\) at \\(25\\ ^\\circ\\text{C}\\). In a separate trial under identical conditions, the student titrates a \\(25.0\\text{ mL}\\) sample of \\(0.10\\text{ M}\\ \\text{NaOH(aq)}\\) with the same \\(0.10\\text{ M}\\ \\text{HCl(aq)}\\) solution. Which of the following correctly predicts and explains the differences observed in the \\(\\text{NH}_3\\text{(aq)}\\) titration curve compared to the \\(\\text{NaOH(aq)}\\) titration curve?"
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url: "https://nerd-notes.com/ubq/123656/"
date_modified: "2026-09-28T12:01:54+00:00"
---

# A student titrates a \(25.0\text{ mL}\) sample of \(0.10\text{ M}\ \text{NH}_3\text{(aq)}\) with \(0.10\text{ M}\ \text{HCl(aq)}\) at \(25\ ^\circ\text{C}\). In a separate trial under identical conditions, the student titrates a \(25.0\text{ mL}\) sample of \(0.10\text{ M}\ \text{NaOH(aq)}\) with the same \(0.10\text{ M}\ \text{HCl(aq)}\) solution. Which of the following correctly predicts and explains the differences observed in the \(\text{NH}_3\text{(aq)}\) titration curve compared to the \(\text{NaOH(aq)}\) titration curve?

A student titrates a \(25.0\text{ mL}\) sample of \(0.10\text{ M}\ \text{NH}_3\text{(aq)}\) with \(0.10\text{ M}\ \text{HCl(aq)}\) at \(25\ ^\circ\text{C}\). In a separate trial under identical conditions, the student titrates a \(25.0\text{ mL}\) sample of \(0.10\text{ M}\ \text{NaOH(aq)}\) with the same \(0.10\text{ M}\ \text{HCl(aq)}\) solution. Which of the following correctly predicts and explains the differences observed in the \(\text{NH}_3\text{(aq)}\) titration curve compared to the \(\text{NaOH(aq)}\) titration curve?

- **A.** The initial \(\text{pH}\) is lower, the volume of \(\text{HCl(aq)}\) required to reach the equivalence point is the same, and the \(\text{pH}\) at the equivalence point is less than \(7.0\) because the product \(\text{NH}_4^+\text{(aq)}\) acts as a weak acid in water.
- **B.** The initial \(\text{pH}\) is lower, the volume of \(\text{HCl(aq)}\) required to reach the equivalence point is smaller, and the \(\text{pH}\) at the equivalence point is equal to \(7.0\) because complete neutralization of any acid and base always yields a neutral solution.
- **C.** The initial \(\text{pH}\) is lower, the volume of \(\text{HCl(aq)}\) required to reach the equivalence point is the same, and the \(\text{pH}\) at the equivalence point is greater than \(7.0\) because unreacted \(\text{NH}_3\text{(aq)}\) remains in solution due to incomplete ionization.
- **D.** The initial \(\text{pH}\) is the same, the volume of \(\text{HCl(aq)}\) required to reach the equivalence point is smaller, and the \(\text{pH}\) at the equivalence point is less than \(7.0\) because \(\text{Cl}^-\text{(aq)}\) ions react with water to produce \(\text{H}_3\text{O}^+\text{(aq)}\).

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/123656/*