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[[Metal Oxide]]s [[Chemical Reaction|react]] with [[water]] to form [[Metal Hydroxides]].
: Na<sub>2</sub>O(s) + H<sub>2</sub>O (l) → 2Na<sup>+</sup>(aq)+2OH<sup>-</sup>(aq): K<sub>2</sub>O(s) + H<sub>2</sub>O (l) → 2K<sup>+</sup>(aq)+2OH<sup>-</sup>(aq): MgO(s) + 2H<sub>2</sub>O (l) → Mg<sup>+2</sup>(aq)+2OH<sup>-</sup>(aq): CaO(s) + 2H<sub>2</sub>O (l) → Ca<sup>+2</sup>(aq)+2OH<sup>-</sup>(aq): Al<sub>2</sub>O<sub>3</sub>(s) + 3H<sub>2</sub>O (l) → 2Al<sup>+3</sup>(aq)+6OH<sup>-</sup>(aq) [[Ammonia]] also [[Chemical Reaction|reacts]] with [[water]] to produce '''hydroxide ions''':: NH<sub>3</sub>O(aq) + H<sub>2</sub>O(l) → NH<sub>4</sub><sup>+</sup>(aq)+OH<sup>-</sup>(aq)