What is the pH of a 0.001 M solution of hydrochloric acid?

What is the pH of a 0.001 M solution of hydrochloric acid?

Step 1: Understand that pH is a measure of how acidic or basic a solution is.
Step 2: Know that hydrochloric acid (HCl) is a strong acid, which means it completely dissociates in water.
Step 3: Recognize that a 0.001 M solution of HCl means there are 0.001 moles of HCl in one liter of water.
Step 4: Since HCl completely dissociates, the concentration of hydrogen ions (H+) in the solution is also 0.001 M.
Step 5: Use the formula for pH, which is pH = -log[H+].
Step 6: Substitute the concentration of H+ into the formula: pH = -log(0.001).
Step 7: Calculate the logarithm: log(0.001) = -3.
Step 8: Therefore, pH = -(-3) = 3.

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