GKFix MCQ Question

What is [H⁺] in human saliva with pH 6.4?

• A. 3.98 × 10⁻⁷ M
• B. 6.4 × 10⁻⁷ M
• C. 1.0 × 10⁻⁶ M
• D. 4.0 × 10⁻⁸ M