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Tetrapolyphosphoric acid H 6 P 4 O 13 yields at least six anions, including tetrapolyphosphate [P 4 O 13] 6−, and so on. Note that each extra phosphoric unit adds one extra P atom, three extra O atoms, and either one extra hydrogen atom or an extra negative charge. Branched polyphosphoric acids give similarly branched polyphosphate anions.
A polyphosphate is a salt or ester of polymeric oxyanions formed from tetrahedral PO 4 structural units linked together by sharing oxygen atoms. Polyphosphates can adopt linear or a cyclic (also called, ring) structures. In biology, the polyphosphate esters ADP and ATP are involved in energy storage.
This page was last edited on 11 February 2023, at 22:36 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
In enzymology, an endopolyphosphatase (EC 3.6.1.10) is an enzyme that catalyzes the chemical reaction. polyphosphate + n H 2 O (n + 1) oligophosphate. Thus, the two substrates of this enzyme are polyphosphate and H 2 O, whereas its product is oligophosphate.
, is the only species present. At pH 13 or higher, the acid is completely dissociated as the phosphate ion, (PO 4) 3−. This means that salts of the mono- and di-phosphate ions can be selectively crystallised from aqueous solution by setting the pH value to either 4.7 or 9.8. In effect, H 3 PO 4, H 2 (PO 4) − and H(PO 4) 2−
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