Pyrophosphoric acid and it's conjugate base, pyrophosphate, is abbreviated PP; and is formed by cells from the hydrolysis of ATP into AMP Pyrophosphoric acid is tetraprotic with pKa values of 0.91, 2.10, 6.70, and 9.32. Pyrophosphoric acid has five possible protonation states in the choices below. Which one of the following protonation states is the most abundant at pH 10.57 ⒸA P₂074 B. HP2₂073- C. H₂P₂072- D. H3P 207 E. H4P207

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