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as the title says. Is b= amount of OH-/ H3O divided by volume of buffer x change in pH wrong to use with polyprotic acids? Can I calculate the buffering capacity of a sodium phosphate buffer made up of NaH2PO4 and NaH2PO4 using this formula?

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    $\begingroup$ Generally, first thing is to check, if you can afford to treat it like if it were not a multiprotic acid. Typically if other pKa are far enough from the supposed pH. $\endgroup$
    – Poutnik
    Commented Dec 8, 2022 at 14:00
  • $\begingroup$ phosphoric acid has 3 pkas. 2.12, 7.21, and 12.4. I'm considering the second pka and pH 7.4 can I treat it as if it isnt multiprotic? $\endgroup$
    – 8675
    Commented Dec 8, 2022 at 14:07
  • $\begingroup$ I take it as your rhetorical question, before you will do the calculations and make the conclusion, with eventual final clarifying questions. $\endgroup$
    – Poutnik
    Commented Dec 8, 2022 at 14:26

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