GKFix MCQ Question

What is the hydrogen ion concentration in black coffee (pH 5.0)?

• A. 1.0 × 10⁻⁵ M
• B. 5.0 × 10⁻⁵ M
• C. 1.0 × 10⁻⁴ M
• D. 2.0 × 10⁻⁵ M