GKFix MCQ Question

What is the hydrogen ion concentration in human blood at pH 7.38?

• A. 4.17 × 10⁻⁸ M
• B. 7.38 × 10⁻⁷ M
• C. 1.0 × 10⁻⁷ M
• D. 6.2 × 10⁻⁸ M