GKFix MCQ Question

What is the hydrogen ion concentration in a 0.05 M ammonia solution if [OH–] = 9.4 × 10^-4 M?

• A. 1.06 × 10^-11 M
• B. 9.4 × 10^-4 M
• C. 1.77 × 10^-5 M
• D. 1.00 × 10^-7 M