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Shyam Dubey • 3.70K Points
Extraordinary

Q. What is the pH of a 0.001 M solution of HCl (a strong acid)?

  • (A) 3
  • (B) 11
  • (C) 1
  • (D) 7
  • Correct Answer - Option(A)
  • Views: 1
  • Filed under category Chemistry
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Explanation by: Shyam Dubey
HCl is a strong acid and fully dissociates: [H+] = 0.001 M = 1 × 10^-3 M. pH = -log[H+] = -log(1×10^-3) = 3. Option 11 corresponds to a very basic solution, not acidic. pH 1 would correspond to 0.1 M H+, and pH 7 is neutral (pure water), not for a 0.001 M strong acid.

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