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Water is amphoteric meaning it can react as an acid or base. While acting as a base it accepts a proton from an acid and becomes a hydronium ion. While acting as an acid, it donates a proton and then becomes a hydroxide ion.
Water can act as both a proton acceptor and a proton donator. It can both accept a proton and become a hydronium ion (thus acting as a base), and donate a proton and become a hydroxide ion (thus acting as an acid). Hope this helps!
Water can act as a Bronsted acid or base because it is capable of donating and accepting H+ ions. H20 can react to become H30+ when it accepts H+ or it can react to become OH- when it donates an H+ ion. Water is thus considered amphoteric because of this duality.
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