① Na3N 过量：Na3N + H2O = 3 NaOH + NH3 ; NaOH + HCl = NaCl + H2O
② HCl 过量: Na3N + H2O = 3 NaOH + NH3 ; NaOH + HCl = NaCl + H2O;
NH3 + HCl = NH4Cl