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Conjugate (acid-base theory)
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==Table of acids and their conjugate bases== Below are several examples of acids and their corresponding conjugate bases; note how they differ by just one proton (H<sup>+</sup> ion). Acid strength decreases and conjugate base strength increases down the table. {| class="wikitable" |- ! Acid ! Conjugate base |- | {{Chem|H|2|F|+}} [[Fluoronium]] ion | HF [[Hydrogen fluoride]] |- | HCl [[Hydrochloric acid]] | Cl<sup>β</sup> [[Chloride]] ion |- | H<sub>2</sub>SO<sub>4</sub> [[Sulfuric acid]] | HSO{{su|b=4|p=β}} [[Hydrogen sulfate]] ion (''bisulfate'' ion) |- | HNO<sub>3</sub> [[Nitric acid]] | NO{{su|b=3|p=β}} [[Nitrate]] ion |- | H<sub>3</sub>O<sup>+</sup> [[Hydronium]] ion | H<sub>2</sub>O [[water (molecule)|Water]] |- | HSO{{su|b=4|p=β}} [[Hydrogen sulfate]] ion | SO{{su|b=4|p=2β}} [[Sulfate]] ion |- | H<sub>3</sub>PO<sub>4</sub> [[Phosphoric acid]] | H<sub>2</sub>PO{{su|b=4|p=β}} [[Dihydrogen phosphate]] ion |- | CH<sub>3</sub>COOH [[Acetic acid]] | CH<sub>3</sub>COO<sup>β</sup> [[Acetate]] ion |- | HF [[Hydrofluoric acid]] | F<sup>β</sup> [[Fluoride]] ion |- | H<sub>2</sub>CO<sub>3</sub> [[Carbonic acid]] | HCO{{su|b=3|p=β}} [[Hydrogen carbonate]] ion |- | H<sub>2</sub>S [[Hydrosulfuric acid]] | HS<sup>β</sup> [[Hydrosulfide]] ion |- | H<sub>2</sub>PO{{su|b=4|p=β}} [[Dihydrogen phosphate]] ion | HPO{{su|b=4|p=2β}} [[Monohydrogen phosphate|Hydrogen phosphate]] ion |- | NH{{su|b=4|p=+}} [[Ammonium]] ion | NH<sub>3</sub> [[Ammonia]] |- | H<sub>2</sub>O Water ([[pH]]=7) | OH<sup>β</sup> [[Hydroxide]] ion |- | HCO{{su|b=3|p=β}} [[Hydrogencarbonate]] ''(bicarbonate)'' ion | CO{{su|b=3|p=2β}} [[Carbonate]] ion |}
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