What is the pH of a solution of a strong monoprotic acid like HCl?

Answer and explanation

Correct answer: C. 1

  1. Step 1: A strong monoprotic acid such as hydrochloric acid () dissociates completely in water, producing a hydronium ion concentration of .
  2. Step 2: The is defined mathematically as the negative base-10 logarithm of hydrogen ion activity: .
  3. Step 3: Substituting gives .
Answer
1.
Why not the others: 2 corresponds to ; 13 is the complementary ; 0 corresponds to .

Practise more Ionic equilibrium.

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