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==Key Stage 4==
===Meaning===
A '''Hydrogen ion'''('''H<sup>+</sup>'''), sometimes called a '''proton''', is a [[Positive Ion|positive ion]] of [[Hydrogen]] found in [[acid]] [[solution]]s.
===About Hydrogen Ions===
===Examples===
Some [[acid]]s are so strong that all of the [[Hydrogen Ion (Chemistry)|Hydrogen ions]] become dissociated from the rest of the [[compound]].
: HCl(saq) → H<sup>+</sup>(aq)+Cl<sup>-</sup>(aq)In many [[acid]]s not all of the [[molecule]]s will lose their [[Hydrogen Ion (Chemistry)|Hydrogen ions]] and this process can be reversed leaving them in a state of [[Chemical Dynamic Equilibrium|equilibrium]]:: H<sub>2</sub>SO<sub>4</sub>(saq) ⇌ H<sup>+</sup>(aq)+HSO<sub>4</sub><sup>-</sup>(aq): HNO<sub>3</sub>(saq) ⇌ H<sup>+</sup>(aq)+NO<sub>3</sub><sup>-</sup>(aq): H<sub>2</sub>CO<sub>3</sub>(saq) ⇌ H<sup>+</sup>(aq)+HCO<sub>3</sub><sup>-</sup>(aq): H<sub>3</sub>PO<sub>4</sub>(saq) ⇌ H<sup>+</sup>(aq)+H<sub>2</sub>PO<sub>4</sub><sup>-</sup>(aq): CH<sub>3</sub>COOH(saq) ⇌ H<sup>+</sup>(aq)+CH<sub>3</sub>COO<sup>-</sup>(aq) ===References=======AQA==== :[https://www.amazon.co.uk/gp/product/0198359381/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359381&linkCode=as2&tag=nrjc-21&linkId=47c8d1ae58d8b3a5e2094cd447154558 ''Hydrogen ions, pages 99, 108, GCSE Chemistry; Third Edition, Oxford University Press, AQA ''] ====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 ''Hydrogen ions, pages 118, 120, 122, 123, GCSE Chemistry, CGP, 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 ''Hydrogen ions, pages 43, 44, GCSE Chemistry; The Revision Guide, 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 ''Hydrogen ions, page 112, Gateway GCSE Combined Science; The Revision Guide, CGP, OCR '']:[https://www.amazon.co.uk/gp/product/0198359829/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359829&linkCode=as2&tag=nrjc-21&linkId=90e8d7b4f039d53035238fa0320fe00b ''Hydrogen ions, pages 118-119, Gateway GCSE Chemistry, Oxford, 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 ''Hydrogen ions, pages 43, 44, Gateway GCSE Chemistry; The Revision Guide, CGP, OCR '']