Understanding the Concepts
* HCl is a strong acid: This means it completely ionizes in water, meaning every HCl molecule breaks down into H+ and Cl- ions.
* pH: A measure of the acidity or alkalinity of a solution. A lower pH indicates a stronger acid. The formula for pH is:
pH = -log[H+], where [H+] is the hydrogen ion concentration.
Calculation
1. Find the hydrogen ion concentration ([H+]): Since HCl is a strong acid and its concentration is 0.0001 M, the hydrogen ion concentration is also 0.0001 M (0.0001 mol/L).
2. Calculate the pH:
pH = -log(0.0001) = 4
Answer: The pH of a 0.0001 M HCl solution is 4.
