Given the balanced equation representing a reaction:
NH3(g) + H2O(l) ==>NH4+(aq) + OH-(aq)
According to one acid-base theory, the NH3(g) molecules act as
(1) an acid because they accept H+ ions
(2) an acid because they donate H+ ions
(3) a base because they accept H+ ions
(4) a base because they donate H+ ions
