GKFix MCQ Question

The pH of a 0.01 M organic acid solution is 4.15. What is the concentration of the anion (A⁻)?

• A. 4.15 × 10⁻⁵ M
• B. 7.08 × 10⁻⁵ M
• C. 1.0 × 10⁻⁴ M
• D. 8.2 × 10⁻⁶ M