NY Regents Chemistry Exam August 2023 Question 48
48 Given the equation representing a system at equilibrium:
NH3(g) + H2O(l) ⇌NH4+(aq) + OH-(aq) In this system, the H2O( l) acts as
(1) an acid, because it accepts an H+
(2) an acid, because it donates an H+
(3) a base, because it accepts an H+
(4) a base, because it donates an H+
Solution: An acid is a proton (H+) donor and a base is a proton (H+) acceptor. That means we can eliminate choices 1 and 4. H2O becomes OH- on the product side which means it lost a hydrogen. This means it acted as an acid in this reaction. Choice 2
Regents Chemistry Prep Course: HERE
Past Exams and Questions: HERE
Contact us for Chemistry Tutoring: HERE