What effect would NH3, NH4NO3 and (NH4)3PO4 has on ground water. and which ion will hydrolytes the most?
This question is one where you are supposed to figure out which compounds are acids and which ones are bases.
For any intermediate chemist, find a Ka and a Kb table, and that will help.
Hopefully you will find that NH3 (ammonia) ...
This solution distinguishes which compounds are acids and bases from looking at their conjugate acids and bases. It also determines if it was a strong or a weak acid/base.