As a preliminary step, perhaps concentrate the ammonia water by
partial freezing. This way, there will be less to distill, less salt
needed, and less ammonia left behind in the boiling flask.
For reference, you can find the ammonia water phase diagram
here:
http://www.ucl.ac.uk/es/research/planetary/undergraduate/dom...
As you can see, an ordinary refrigerator should be able to take you
up to 10% or 15%. |