1: 26.5 percent / 10percent HCl / H2O / 3 h 2: 2.) NaOH / 1.) ethanol, 1.5 h; 2.) water, heated on a water-bath 3 h 3: 70 percent / 1percent HCl, 10percent sodium carbonate / 1 h / Heating View Scheme

1: 80 percent / NaOH / H2O / 2.5 h / Heating 2: 69.3 percent / 1percent HCl, 10percent sodium carbonate / 1 h View Scheme

hydrogenchloride in water 3 h;