Question

Write two chwmical equation to justify that nh3 is basic in nature

Answer 1

========================================
Here's your answer :
========================================
You need to compare NH3 with H2O. Oxygen is more electronegative than nitrogen. H2O is therefore less likely to donate some of its electrons to form H3O+

NH3 + H2O --> NH4+ + OH-


EDIT: The lone pair on nitrogen means that it can act as a base. However, it does not explain why NH3 is more basic than water: Water also has lone pairs (it has two). You need electronegativity to explain the difference in basicity
=========================================
Hope it helps.
=========================================