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: Al(OH)<sub>3</sub>(aq) → Al<sup>+3</sup>(aq)+3OH<sup>-</sup>(aq)
[[Metal Oxide]]s [[Chemical Reaction|react]] with [[water]] to form [[product|produce]] [[Metal Hydroxides]]which also form '''Hydroxide ions'''.
: 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)
: 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 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)