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Phosphoric acid is a triprotic acid (Ka1 = 6.9× 10–3, Ka2 = 6.2× 10–8, and Ka3...

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Chemistry

Phosphoric acid is a triprotic acid (Ka1 = 6.9× 10–3, Ka2 = 6.2×10–8, and Ka3 = 4.8× 10–13). To find the pH of a buffer composed ofH2PO4–(aq) and HPO42–(aq), which pKa value would you use in theHenderson-Hasselbalch equation?

Calculate the pH of a buffer solution obtained by dissolving15.0 g of KH2PO4(s) and 33.0 g of Na2HPO4(s) in water and thendiluting to 1.00 L.

Answer & Explanation Solved by verified expert
4.0 Ratings (782 Votes)
Before determining which pKa value would you use inthe HendersonHasselbalch equation we first of all need to knowWhat is HendersonHasselbalch equation brieflySo this equation is mainly used to determine the pH value of aBuffer solution using the acidity or pKa value of    See Answer
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