Answer:
Water has the ability to act as an acid
as well as a base, e., it behaves as an amphoteric substance. It acts as an acid
with \[\text{N}{{\text{H}}_{\text{3}}}\]and a base with\[{{H}_{2}}S\].
\[\underset{Acid}{\mathop{{{H}_{2}}O}}\,+N{{H}_{3}}\underset{{}}{\leftrightarrows}\underset{Acid}{\mathop{NH_{4}^{+}}}\,+\underset{Base}{\mathop{O{{H}^{-}}}}\,\]
\[\underset{Base}{\mathop{{{H}_{2}}O}}\,+\underset{Acid}{\mathop{{{H}_{2}}S}}\,\underset{{}}{\leftrightarrows}\underset{Acid}{\mathop{{{H}_{3}}{{O}^{+}}}}\,+\underset{Base}{\mathop{H{{S}^{-}}}}\,\]
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