GKFix MCQ Question

What is the expression for the base dissociation constant (Kb) of NH3?

• A. Kb = [NH3]/[NH4+][OH–]
• B. Kb = [NH4+][OH–]/[NH3]
• C. Kb = [NH4+]/[NH3][OH–]
• D. Kb = [OH–]/[NH3]