A solution has a pH of 9. What is its hydrogen ion concentration [H+]?
- A. 1 × 10^-8 M
- B. 1 × 10^-10 M
- C. 1 × 10^-9 M ✓
- D. 1 × 10^9 M
Correct answer
C. 1 × 10^-9 M
Explanation
pH = -log[H+], so [H+] = 10^-pH = 10^-9 = 1 × 10^-9 M.
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