GKFix MCQ Question

What is the ionization constant of the conjugate acid of NH3 if Kb for NH3 is 1.77 × 10^-5?

• A. 5.64 × 10^-10
• B. 1.77 × 10^-5
• C. 1.00 × 10^-14
• D. 9.25 × 10^-9