Why can't ammonia be dried by concentrated sulphuric acid?

Answer 1

Ammonia is a gas a room temperature able to dissolve into water at a fairly descent rate. Unless the solution is super chilled to the boiling point of ammonia gas, which isn't likely to happen anyway as the solution would probably be solid, not to mention to dehydration of water by sulfuric acid is extremely exothermic which would boil off the pure ammonia. In addition ammonia is considered to be a fairly descent base and would react immediately with sulfuric acid to produce ammonium bisulfate which is very water soluble. Basically the removal of water with sulfuric acid from ammonia will never be a good idea.