is h20 an acid or base?

What is the conjugate base of water (H2O)?

Both NH3 and H2O are amphoteric (they have H atoms that can be donated as H+ ions and thus act as acids and lone-pair electrons that can accept an H+ and thus act as bases). Thus, either NH3 or H2O can act as an acid or a base.

Conjugate Acid Base Pairs, Arrhenius, Bronsted Lowry and Lewis Definition – Chemistry

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