---
title: "A student prepares a buffer solution by mixing 100. \\text{ mL} of a 1.0 \\text{ M} solution of a weak acid, \\text{HA} (K_a = 1.0 \\times 10^{-4}), with 100. \\text{ mL} of a 0.10 \\text{ M} solution of \\text{NaA}. What is the pH of the resulting buffer solution at 25^\\circ\\text{C}?"
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/119301/"
date_modified: "2026-08-19T12:39:43+00:00"
---

# A student prepares a buffer solution by mixing 100. \text{ mL} of a 1.0 \text{ M} solution of a weak acid, \text{HA} (K_a = 1.0 \times 10^{-4}), with 100. \text{ mL} of a 0.10 \text{ M} solution of \text{NaA}. What is the pH of the resulting buffer solution at 25^\circ\text{C}?

A student prepares a buffer solution by mixing 100. \text{ mL} of a 1.0 \text{ M} solution of a weak acid, \text{HA} (K_a = 1.0 \times 10^{-4}), with 100. \text{ mL} of a 0.10 \text{ M} solution of \text{NaA}. What is the pH of the resulting buffer solution at 25^\circ\text{C}?

- **A.** \(3.00\)
- **B.** \(4.00\)
- **C.** \(5.00\)
- **D.** \(11.00\)

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/119301/*