Phosphoric acid is a triprotic acid (Kal = 6.9 x 10-3, K2 = 6.2 x 10-8, and K₁3 = 4.8 × 10-¹3).To find the pH of a buffer composed of H₂PO (aq) and HPO2 (aq), which pKa value should be used in theHenderson-Hasselbalch equation?O PKal = 2.16O pK₁2 = 7.21a2O pk₂3 = 12.32a3Calculate the pH of a buffer solution obtained by dissolving 16.0 g of KH₂PO4(s) and 30.0 g of Na₂HPO4(s) in water and thendiluting to 1.00 L.pH =

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Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

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Phosphoric acid is a triprotic acid (Kal = 6.9 x 10-3, K2 = 6.2 x 10-8, and K₁3 = 4.8 × 10-¹3).
To find the pH of a buffer composed of H₂PO (aq) and HPO2 (aq), which pKa value should be used in the
Henderson-Hasselbalch equation?
O PKal = 2.16
O pK₁2 = 7.21
a2
O pk₂3 = 12.32
a3
Calculate the pH of a buffer solution obtained by dissolving 16.0 g of KH₂PO4(s) and 30.0 g of Na₂HPO4(s) in water and then
diluting to 1.00 L.
pH =

Expert Solution

Step 1

First, we have to find the value of pKa of phosphoric acid that should be used to calculate the pH of a buffer composed of H₂PO₄^-(aq) and HPO₄^2-(aq).

Next, we have to find the pH of a buffer solution obtained by dissolving 16.0 g KH₂PO₄(s) and 30.0 g of Na₂HPO₄(s) in water and then diluting it to 1.00 L.

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