GKFix MCQ Question

What is [H⁺] in lemon juice if pH = 2.2?

• A. 6.31 × 10⁻³ M
• B. 2.2 × 10⁻³ M
• C. 1.0 × 10⁻³ M
• D. 5.0 × 10⁻³ M