Phosphates

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In chemistry, a phosphate is an anion, salt, functional group or ester derived from a phosphoric acid. It most commonly means orthophosphate, a derivative of orthophosphoric acid, aka. phosphoric acid H3PO4.

The phosphate or orthophosphate ion [PO4]3− is derived from phosphoric acid by the removal of three protons H+. Removal of one proton gives the dihydrogen phosphate ion [H2PO4]− while removal of two ions gives the hydrogen phosphate ion [HPO4]2−. These names are also used for salts of those anions, such as ammonium dihydrogen phosphate and trisodium phosphate.

H3PO4Phosphoricacid

[H2PO4]−Dihydrogenphosphate
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    Image: Geomuseum der WWU Münster - CC BY-NC-SA

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    NaAl3(PO4)2(OH)4,...

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