What is the pH of a solution of hydrochloric acid (HCl) at a concentration of 0.

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Question: What is the pH of a solution of hydrochloric acid (HCl) at a concentration of 0.1 M?

Options:

Correct Answer: 1

Solution:

A 0.1 M solution of hydrochloric acid has a pH of approximately 1, indicating it is a strong acid.

What is the pH of a solution of hydrochloric acid (HCl) at a concentration of 0.1 M?

What is the pH of a solution of hydrochloric acid (HCl) at a concentration of 0.1 M?

Step 1: Understand that hydrochloric acid (HCl) is a strong acid, which means it completely dissociates in water.
Step 2: Know that the concentration of HCl is given as 0.1 M (molar). This means there are 0.1 moles of HCl in 1 liter of solution.
Step 3: Since HCl is a strong acid, it will release 0.1 moles of hydrogen ions (H+) into the solution.
Step 4: The concentration of hydrogen ions (H+) in the solution is therefore also 0.1 M.
Step 5: Use the formula for pH, which is pH = -log[H+]. Here, [H+] is the concentration of hydrogen ions.
Step 6: Calculate the pH: pH = -log(0.1). This equals 1.
Step 7: Conclude that the pH of a 0.1 M solution of hydrochloric acid is approximately 1.

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