A solution has a pH of 9. What is its hydrogen ion concentration [H+]?
Difficulty: Medium
About this MCQ
Medium MCAT item. Correct choice: C. 1 × 10^-9 M.
- A. 1 × 10^-8 M
Why not A: “1 × 10^-8 M” is not 1 × 10^-9 M.
- B. 1 × 10^-10 M
Why not B: “1 × 10^-10 M” is not 1 × 10^-9 M.
- C. 1 × 10^-9 M ✓
- D. 1 × 10^9 M
Why not D: “1 × 10^9 M” is not 1 × 10^-9 M.
Correct answer
C. 1 × 10^-9 M
Explanation
1 × 10^-9 M (option C) is the accepted answer to “A solution has a pH of 9. What is its hydrogen ion concentration [H+]”. Option A (1 × 10^-8 M) is a different value from 1 × 10^-9 M. Option B (1 × 10^-10 M) is a different value from 1 × 10^-9 M. Option D (1 × 10^9 M) is a different value from 1 × 10^-9 M. Keep 1 × 10^-9 M as the MCAT fact for this stem.
Source: Original practice question, MCQsHub
Tags: solution hydrogen, hydrogen concentration, 1 × 10^-10 M, 1 × 10^-9 M
Submitted by: MCQsHub Editorial
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