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==Ions== The ~~arsenates~~arsenate ~~are~~is derived from [[arsenic acid]], H<sub>3</sub>AsO<sub>4</sub>. This moderately strong acid converts to '''dihydrogen arsenate''' ({{chem\|H\|2\|AsO\|4\|−}}), '''hydrogen arsenate''' ({{chem\|HAsO\|4\|2−}}), and arsenate ({{chem\|AsO\|4\|3−}}), depending on pH. The quantitative relationship between these species is defined by the acid dissociation constants: :H<sub>3</sub>AsO<sub>4</sub> + H<sub>2</sub>O {{eqm}} H<sub>2</sub>AsO{{su\|b=4\|p=−}} + H<sub>3</sub>O<sup>+</sup> (''K''<sub>1</sub> = 10<sup>−2.19</sup>) :H<sub>2</sub>AsO{{su\|b=4\|p=−}} + H<sub>2</sub>O {{eqm}} HAsO{{su\|b=4\|p=2−}} + H<sub>3</sub>O<sup>+</sup> (''K''<sub>2</sub> = 10<sup>−6.94</sup>)

Arsenate: Difference between revisions

Arsenate (edit)