GKFix MCQ Question

For a 0.01 M acid with pH 4.15, what is the ionization constant (Ka)?

• A. 5.0 × 10⁻⁷
• B. 7.08 × 10⁻⁵
• C. 1.0 × 10⁻⁶
• D. 3.5 × 10⁻⁸