One of the most important chemical properties of water is its ability to behave as both an acid (a proton donor) and a base (a proton acceptor), the characteristic property of amphoteric substances. This behaviour is most clearly seen in the autoionization of water: H 2 O (l) + H 2 O (l) ⇌ H 3 O + (aq) + OH − (aq), where the (l) represents ... More @Wikipedia
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