Write two reactions to explain the amphoteric nature of water.

(N/A) Water is amphoteric in nature,meaning it can act as both an acid and a base.
$1$. As an acid (reacting with a base like $NH_3$):
$H_2O(l) + NH_3(aq) \rightleftharpoons OH^-(aq) + NH_4^+(aq)$
$2$. As a base (reacting with an acid like $H_2S$):
$H_2O(l) + H_2S(aq) \rightleftharpoons H_3O^+(aq) + HS^-(aq)$
These reactions demonstrate that water can donate a proton $(H^+)$ to act as an acid or accept a proton to act as a base.