GKFix MCQ Question

What is the concentration of HS⁻ in a 0.1 M H₂S solution, given Ka₁ = 9.1 × 10⁻⁸?

• A. 3.02 × 10⁻⁴ M
• B. 9.54 × 10⁻⁵ M
• C. 1.2 × 10⁻¹³ M
• D. 8.2 × 10⁻⁶ M