1: NH4Cl, conc NH3 aq / H2O / 2 h / 0 - 20 °C 2: conc. HCl / 15 h / Heating View Scheme

hydrogenchloride; ammonium chloride 1.) water, 0 - 20 degC, 2 h, 2.) water, reflux, 15 h; Yield given. Multistep reaction;