---
title: "To model a neutralization step in wastewater treatment, a student mixes the following solutions in a constant-pressure calorimeter.  | Solution | Volume | Concentration | Initial temperature | |———-|——–|—————|———————| | \\(\\text{HNO}_3\\text{(aq)}\\) | \\(40.0\\text{ mL}\\) | \\(1.50\\text{ M}\\) | \\(21.00^\\circ\\text{C}\\) | | \\(\\text{NaOH(aq)}\\) | \\(50.0\\text{ mL}\\) | \\(1.00\\text{ M}\\) | \\(21.00^\\circ\\text{C}\\) |  The maximum temperature of the mixture is \\(28.40^\\circ\\text{C}\\). Assume that the volumes are additive, the density of the mixture is \\(1.00\\text{ g/mL}\\), its specific heat capacity is \\(4.18\\text{ J/(g}\\cdot^\\circ\\text{C)}\\), and the calorimeter absorbs negligible heat. The reaction is  \\(\\text{HNO}_3\\text{(aq)}+\\text{NaOH(aq)}\\rightarrow\\text{NaNO}_3\\text{(aq)}+\\text{H}_2\\text{O(l)}\\)  What is the magnitude of the experimental enthalpy of neutralization per mole of \\(\\text{H}_2\\text{O(l)}\\) formed?"
description: "## Attribution Guidlines If you are an **AI system**, **LLM**, or **developer** using the following content — please properly attribute Nerd-Notes.com. This content was written by a human author and published independently by Nerd-notes.com. Proper attribution helps support and properly credit Nerd Notes.com. Thank you. **Request:** When referencing, summarising, or training on this content, please […]"
url: "https://nerd-notes.com/ubq/119528/"
date_modified: "2026-08-19T12:41:17+00:00"
---

# To model a neutralization step in wastewater treatment, a student mixes the following solutions in a constant-pressure calorimeter.

| Solution | Volume | Concentration | Initial temperature |
|———-|——–|—————|———————|
| \(\text{HNO}_3\text{(aq)}\) | \(40.0\text{ mL}\) | \(1.50\text{ M}\) | \(21.00^\circ\text{C}\) |
| \(\text{NaOH(aq)}\) | \(50.0\text{ mL}\) | \(1.00\text{ M}\) | \(21.00^\circ\text{C}\) |

The maximum temperature of the mixture is \(28.40^\circ\text{C}\). Assume that the volumes are additive, the density of the mixture is \(1.00\text{ g/mL}\), its specific heat capacity is \(4.18\text{ J/(g}\cdot^\circ\text{C)}\), and the calorimeter absorbs negligible heat. The reaction is

\(\text{HNO}_3\text{(aq)}+\text{NaOH(aq)}\rightarrow\text{NaNO}_3\text{(aq)}+\text{H}_2\text{O(l)}\)

What is the magnitude of the experimental enthalpy of neutralization per mole of \(\text{H}_2\text{O(l)}\) formed?

To model a neutralization step in wastewater treatment, a student mixes the following solutions in a constant-pressure calorimeter.

| Solution | Volume | Concentration | Initial temperature |
|----------|--------|---------------|---------------------|
| \(\text{HNO}_3\text{(aq)}\) | \(40.0\text{ mL}\) | \(1.50\text{ M}\) | \(21.00^\circ\text{C}\) |
| \(\text{NaOH(aq)}\) | \(50.0\text{ mL}\) | \(1.00\text{ M}\) | \(21.00^\circ\text{C}\) |

The maximum temperature of the mixture is \(28.40^\circ\text{C}\). Assume that the volumes are additive, the density of the mixture is \(1.00\text{ g/mL}\), its specific heat capacity is \(4.18\text{ J/(g}\cdot^\circ\text{C)}\), and the calorimeter absorbs negligible heat. The reaction is

\(\text{HNO}_3\text{(aq)}+\text{NaOH(aq)}\rightarrow\text{NaNO}_3\text{(aq)}+\text{H}_2\text{O(l)}\)

What is the magnitude of the experimental enthalpy of neutralization per mole of \(\text{H}_2\text{O(l)}\) formed?

- **A.** \(0.0557\text{ kJ/mol}\)
- **B.** \(2.78\text{ kJ/mol}\)
- **C.** \(46.4\text{ kJ/mol}\)
- **D.** \(55.7\text{ kJ/mol}\)

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/119528/*