At equilibrium, the concentration of CH₃COOH is 2.0 × 10⁻¹ M, the concentration of CH₃COO⁻ is 1.9 × 10⁻³ M, and the concentration of H₃O⁺ is 1.9 × 10⁻³ M. What is the value of Keq for this reaction?
A. 1.8 × 10⁻⁵ B. 5.5 × 10⁴ C. 9.5 × 10⁻³ D. 1.1 × 10²
