GKFix MCQ Question

What is the concentration of S²⁻ in a 0.1 M H₂S solution that is also 0.1 M in HCl?

• A. 1.092 × 10⁻²¹ M
• B. 1.2 × 10⁻¹³ M
• C. 9.1 × 10⁻⁸ M
• D. 1.09 × 10⁻²⁰ M