What is the pH of a 0.020 M solution of hydrochloric acid at 25 degrees Celsius?
Answer and explanation
Correct answer: A. 1.70
- Step 1: HCl is a strong acid, so [H+] = 0.020 M.
- Step 2: pH = -log10(0.020) = 1.70.
Answer
1.70.
Why not the others: 2.00 would be 0.010 M; 1.30 is -log(0.05); 12.30 is the pH of a 0.020 M strong base.
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