Phosphoric acid is a triprotic acid (Ka1 = 6.9 x 10-3, K2 = 6.2 × 10-8, and K,3 = 4.8 × 10-13). To find the pH of a buffer composed of H,PO, (aq) and HPO? (aq), which pK, value should be used in the Henderson-Hasselbalch equation? O pKal = 2.16 O pK2 = 7.21 %3D O PKA3 = 12.32 Calculate the pH of a buffer solution obtained by dissolving 15.0 g of KH, PO, (s) and 32.0 g of Na,HPO,(s) in water and then diluting to 1.00 L. pH =

Chemistry: Principles and Reactions
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Chapter14: Equilibria In Acid-base Solutions
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Phosphoric acid is a triprotic acid (Kal = 6.9 × 10-3, K,2 = 6.2 x 10-8, and K3 = 4.8 x 10-13).
To find the pH of a buffer composed of H,PO, (aq) and HPO (aq), which pKa value should be used in the
Henderson-Hasselbalch equation?
O pKal = 2.16
O pK2 = 7.21
O pK3 = 12.32
Calculate the pH of a buffer solution obtained by dissolving 15.0 g of KH,PO, (s) and 32.0 g of Na, HPO,(s) in water and then
diluting to 1.00 L.
pH =
Transcribed Image Text:Phosphoric acid is a triprotic acid (Kal = 6.9 × 10-3, K,2 = 6.2 x 10-8, and K3 = 4.8 x 10-13). To find the pH of a buffer composed of H,PO, (aq) and HPO (aq), which pKa value should be used in the Henderson-Hasselbalch equation? O pKal = 2.16 O pK2 = 7.21 O pK3 = 12.32 Calculate the pH of a buffer solution obtained by dissolving 15.0 g of KH,PO, (s) and 32.0 g of Na, HPO,(s) in water and then diluting to 1.00 L. pH =
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