Identify the acid and the base in the following reactions. (Type your answer using the format CO2 for CO2, (NH4)2CO3 for (NH4)2CO3, [NH4]+ for NH4+, and [Ni(CN)4]2- for Ni(CN)42-. Do not include state symbols in the answers.)
(a) HCl(aq) + NH3(aq) NH4+(aq) + Cl -(aq)
(b) NH3(aq) + HCN(aq) NH3+(aq) + CN -(aq)
(c) HNO3(aq) + CH3NH2(aq) CH3NH3+(aq) + NO3-(aq)