When ammonia reacts with water, what is the result?

• When ammonia (NH3) reacts with water (H2O), it forms ammonium hydroxide (NH4OH). This is a basic solution, which means it increases the pH of the solution. The chemical reaction is as follows:
NH3 + H2O → NH4OH

• Further, NH4OH dissociates into ammonium ions (NH4+) and hydroxide ions (OH-):
NH4OH → NH4+ + OH-
The increase in hydroxide ions (OH-) is what causes the increase in pH.