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[[Metal Oxide]]s [[Chemical Reaction|react]] with [[water]] to form [[Metal Hydroxides]].
: NaO(s) + H<sub>2</sub>O → Na<sup>+</sup>(aq)+OH<sup>-</sup>(aq)
: KOHKO(aq) + H<sub>2</sub>O → K<sup>+</sup>(aq)+OH<sup>-</sup>(aq): Mg(OHO)<sub>2</sub>(aq) + 2H<sub>2</sub>O → Mg<sup>+2</sup>(aq)+2OH<sup>-</sup>(aq): Ca(OHO)<sub>2</sub>(aq) + 2H<sub>2</sub>O → Ca<sup>+2</sup>(aq)+2OH<sup>-</sup>(aq): Al(OHO)<sub>3</sub>(aq) + 3H<sub>2</sub>O → Al<sup>+3</sup>(aq)+3OH<sup>-</sup>(aq)