GKFix MCQ Question

What is the hydrogen ion concentration of a solution with pH = 9?

• A. 1.0 × 10⁻⁷ M
• B. 1.0 × 10⁻⁸ M
• C. 1.0 × 10⁻⁹ M
• D. 1.0 × 10⁻¹⁰ M