A solution has a pH of 3. What is its hydrogen ion concentration [H+]?
Difficulty: Medium
About this MCQ
Medium MCAT item. Correct choice: B. 1 × 10^-3 M.
- A. 1 × 10^3 M
Why not A: “1 × 10^3 M” is not 1 × 10^-3 M.
- B. 1 × 10^-3 M ✓
- C. 1 × 10^-4 M
Why not C: “1 × 10^-4 M” is not 1 × 10^-3 M.
- D. 1 × 10^-2 M
Why not D: “1 × 10^-2 M” is not 1 × 10^-3 M.
Correct answer
B. 1 × 10^-3 M
Explanation
1 × 10^-3 M (option B) is the accepted answer to “A solution has a pH of 3. What is its hydrogen ion concentration [H+]”. Option A (1 × 10^3 M) is a different value from 1 × 10^-3 M. Option C (1 × 10^-4 M) is a different value from 1 × 10^-3 M. Option D (1 × 10^-2 M) is a different value from 1 × 10^-3 M. Keep 1 × 10^-3 M as the MCAT fact for this stem.
Source: Original practice question, MCQsHub
Tags: solution hydrogen, hydrogen concentration, concentration -log, 1 × 10^-3 M
Submitted by: MCQsHub Editorial
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