Here's how it works:
* Water as an acid: Water can donate a proton (H+) to form the hydroxide ion (OH-). This happens when water reacts with a base.
* Example: HCl (acid) + H₂O (base) → H₃O+ (hydronium ion) + Cl-
* Water as a base: Water can accept a proton (H+) to form the hydronium ion (H₃O+). This happens when water reacts with an acid.
* Example: NH₃ (base) + H₂O (acid) → NH₄+ (ammonium ion) + OH-
The ability of water to act as both an acid and a base allows it to participate in reactions that produce acids and bases.
In summary:
The amphoteric nature of water, its ability to both donate and accept protons, is the key to its role in acid-base chemistry.
