has studied chemistry should remember, ammonia nitrogen hydrogen can system, so ammonia nitrogen hydrogen system needs to be done under what conditions, what use?
N2+3H2=2NH3: conditions are high temperature (500¡æ), high pressure (40 to 60Mpa), catalyst (iron catalyst) First, although nitrogen and hydrogen can react to form ammonia, but the reaction is a reversible reaction product, so the produced is unlikely to be pure ammonia.
Secondly, the reaction requires a relatively high temperature, about 500 degrees, coupled with the need for high pressure, catalyst conditions, for the general laboratory is harsh, can not be achieved, so the general laboratory is to use another method:
2NH4Cl+Ca (OH) 2= heating =CaCl2+2NH3+2H2O