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==Key Stage 4==
===Meaning===
A '''Hydroxide ion''' ('''OH<sup>-</sup>'''), is a [[Negative Ion|positive negative ion]] of [[Hydrogen]] [[bond]]ed to [[Oxygen]] found in [[acid]] [[solution]]s.
===About Hydroxide Ions===
: When a [[base|basic]] [[compound]] [[dissolve]]s in [[water]] it forms '''Hydroxide ions'''.
: '''Hydroxides''' in [[solution]] are [[alkali]]s.
: '''Hydroxide ions''' are responsible for the [[corrosive]] [[property|properties]] of [[alkali]]s.
: '''Hydroxide''' has gained an [[electron]]s to have a relative [[Electrical Charge|charge]] of -1.
: '''Hydroxide''' forms [[Ionic Bond|ionic bond]]s with [[Positive Ion|positive ions]].
: '''Hydroxides''' are [[Ionic Compound|ionic compounds]].
===Examples===
: 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'''.: NaONa<sub>2</sub>O(s) + H<sub>2</sub>O (l) → Na2Na<sup>+</sup>(aq)+OH2OH<sup>-</sup>(aq): KOK<sub>2</sub>O(aqs) + H<sub>2</sub>O (l) → K2K<sup>+</sup>(aq)+OH2OH<sup>-</sup>(aq): MgMgO(Os)+ 2H<sub>2</sub>O(l) → Mg<sup>+2</sup>(aq)+2OH<sup>-</sup>(aq): CaO(s) + 2H<sub>2</sub>O (l) → MgCa<sup>+2</sup>(aq)+2OH<sup>-</sup>(aq): Ca(Al<sub>2</sub>O)<sub>23</sub>(aqs) + 2H3H<sub>2</sub>O (l) → Ca2Al<sup>+23</sup>(aq)+2OH6OH<sup>-</sup>(aq) [[Ammonia]] also [[Chemical Reaction|reacts]] with [[water]] to produce '''Hydroxide ions''':: Al(O)NH<sub>3</sub>O(aq) + 3HH<sub>2</sub>O → Al(l) ⇌ NH<sub>4</sub><sup>+3</sup>(aq)+3OHOH<sup>-</sup>(aq) ====Edexcel==== :[https://www.amazon.co.uk/gp/product/1782945725/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945725&linkCode=as2&tag=nrjc-21&linkId=694be7494de75af3349537d34e13f7f0 ''Hydroxide ions, page 43, GCSE Chemistry; The Revision Guide, CGP, Edexcel '']:[https://www.amazon.co.uk/gp/product/1782948147/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782948147&linkCode=as2&tag=nrjc-21&linkId=f63dcd8345f4e49c717b39a228a36c7c ''Hydroxide ions, pages 118, 120, GCSE Chemistry, CGP, Edexcel ''] ====OCR====:[https://www.amazon.co.uk/gp/product/1782945695/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945695&linkCode=as2&tag=nrjc-21&linkId=ceafcc80bcad6b6754ee97a0c7ceea53 ''Hydroxide ions, page 112, Gateway GCSE Combined Science; The Revision Guide, CGP, OCR '']:[https://www.amazon.co.uk/gp/product/1782945679/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945679&linkCode=as2&tag=nrjc-21&linkId=a2db42f7b4bdf10cafaafa3bb9120940 ''Hydroxide ions, page 43, Gateway GCSE Chemistry; The Revision Guide, CGP, OCR '']