A solution has a pH of 4. What is its hydrogen ion concentration [H+]?
- A. 1 × 10^4 M
- B. 1 × 10^-3 M
- C. 1 × 10^-5 M
- D. 1 × 10^-4 M ✓
Correct answer
D. 1 × 10^-4 M
Explanation
pH = -log[H+], so [H+] = 10^-pH = 10^-4 = 1 × 10^-4 M.
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