1. The reactions are as follows:
Acid + Base Salt + Water
(a) HCl + NH4OH NH4Cl + H2O
(b) H2SO4 + 2 NH4OH (NH4)2SO4 + 2 H2O
(c) 2 CH3COOH + Mg(OH)2 (CH3COO)2Mg + 2 H2O