Finding pH of a buffer with polyprotic acid

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The discussion revolves around calculating the pH of a buffer solution created by mixing specific amounts of NaOH, Na2HPO4, and H3PO4. Participants emphasize the importance of considering the contributions of both the strong base (NaOH) and the polyprotic acid (H3PO4) in the neutralization process. The Henderson-Hasselbalch equation is suggested for determining pH, but there is confusion about the correct ratios of acid to conjugate base due to the presence of multiple acidic species. The conversation highlights the need to account for the sequential neutralization of the acid's protons and the resulting concentrations of the conjugate acids and bases. Ultimately, understanding the reactions and their stoichiometry is crucial for accurately calculating the pH of the buffer solution.
  • #31
Wow, thanks! Hahaha, that was the most frustrating problem I've dealt with in a while, but it feels very good to have gotten through it. Thanks for all the help!
 

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