---
title: "A student prepares a \\(0.020\\text{ M}\\) aqueous solution of acetic acid, \\(\\text{CH}_3\\text{COOH(aq)}\\), at \\(25\\ ^\\circ\\text{C}\\). The acid ionization constant, \\(K_a\\), for \\(\\text{CH}_3\\text{COOH}\\) at this temperature is \\(1.8 \\times 10^{-5}\\).  \\[\\text{CH}_3\\text{COOH(aq)} + \\text{H}_2\\text{O(l)} \\rightleftharpoons \\text{H}_3\\text{O}^+\\text{(aq)} + \\text{CH}_3\\text{COO}^-\\text{(aq)}\\]  Based on this information, what is the percent ionization of \\(\\text{CH}_3\\text{COOH}\\) in the solution?"
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/119739/"
date_modified: "2026-08-21T08:12:11+00:00"
---

# A student prepares a \(0.020\text{ M}\) aqueous solution of acetic acid, \(\text{CH}_3\text{COOH(aq)}\), at \(25\ ^\circ\text{C}\). The acid ionization constant, \(K_a\), for \(\text{CH}_3\text{COOH}\) at this temperature is \(1.8 \times 10^{-5}\).

\[\text{CH}_3\text{COOH(aq)} + \text{H}_2\text{O(l)} \rightleftharpoons \text{H}_3\text{O}^+\text{(aq)} + \text{CH}_3\text{COO}^-\text{(aq)}\]

Based on this information, what is the percent ionization of \(\text{CH}_3\text{COOH}\) in the solution?

A student prepares a \(0.020\text{ M}\) aqueous solution of acetic acid, \(\text{CH}_3\text{COOH(aq)}\), at \(25\ ^\circ\text{C}\). The acid ionization constant, \(K_a\), for \(\text{CH}_3\text{COOH}\) at this temperature is \(1.8 \times 10^{-5}\).

\[\text{CH}_3\text{COOH(aq)} + \text{H}_2\text{O(l)} \rightleftharpoons \text{H}_3\text{O}^+\text{(aq)} + \text{CH}_3\text{COO}^-\text{(aq)}\]

Based on this information, what is the percent ionization of \(\text{CH}_3\text{COOH}\) in the solution?

- **A.** \(0.030\%\)
- **B.** \(0.090\%\)
- **C.** \(3.0\%\)
- **D.** \(30\%\)

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/119739/*