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HPO42- is the most abundant phosphate present at pH=7.5, but H2PO42- is also there in (less) significant amounts. PO43- and H3PO4 are practically absent at pH 7.5.

This is because it is between the values

  • pH=pKa,3= 12.4 (at which value there is 50% HPO42- and 50% PO43-)

    and

  • pH=pKa,2= 7.2 (at which value there is 50% HPO42- + 50% H2PO42-)

[Cf. Related links: A graph of "The phosphate presency"]

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