The Model: Ammonia When ammonia is added to water, the following reaction occurs: NH3(aq) + H2O(1) - NHA*(aq) + OH(aq) Key Questions 6 a. When you see the formula "HX", what are you prone to expect the compound HX to be? b. For many nonmetal hydrides, the formula is written with the hydrogen atoms first. Why is the formula of ammonia not written as "HAN"? 7. Ammonia is a (circle one) (A) strong acid. (B) weak acid. (C) strong base. (D) weak base. 8. Aqueous solutions of ammonia are often labeled as "NH,OH(aq)". Explain why this may not be an appropriate way to label such a solution