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Phosphoric acid is a triprotic acid (Kal = 6.9 x 10-³, K₁2: = 6.2 x 10-8, and K₁3 = 4.8 x 10-13). To find the pH of a buffer composed of H₂PO (aq) and HPO2 (aq), which pK, value should be used in the Henderson-Hasselbalch equation? pKal = 2.16 PK₁2 = 7.21 OPK₁3 = 12.32 Calculate the pH of a buffer solution obtained by dissolving 17.0 g of KH₂PO4(s) and 28.0 g of Na₂HPO4(s) in water and then diluting to 1.00 L.

Phosphoric acid is a triprotic acid (Kal = 6.9 x 10-³, K₁2: = 6.2 x 10-8, and K₁3 = 4.8 x 10-13). To find the pH of a buffer composed of H₂PO (aq) and HPO2 (aq), which pK, value should be used in the Henderson-Hasselbalch equation? pKal = 2.16 PK₁2 = 7.21 OPK₁3 = 12.32 Calculate the pH of a buffer solution obtained by dissolving 17.0 g of KH₂PO4(s) and 28.0 g of Na₂HPO4(s) in water and then diluting to 1.00 L.

Chemistry
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
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Phosphoric acid is a triprotic acid (Kal = 6.9 x 10-3, K₁2 = 6.2 x 10-8, and K₁3 = 4.8 x 10-13). a2 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 pK ₁2 = 7.21 a2 OpK₂3 = 12.32 Calculate the pH of a buffer solution obtained by dissolving 17.0 g of KH₂PO4(s) and 28.0 g of Na₂HPO4(s) in water and then diluting to 1.00 L. pH =
Transcribed Image Text:Phosphoric acid is a triprotic acid (Kal = 6.9 x 10-3, K₁2 = 6.2 x 10-8, and K₁3 = 4.8 x 10-13). a2 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 pK ₁2 = 7.21 a2 OpK₂3 = 12.32 Calculate the pH of a buffer solution obtained by dissolving 17.0 g of KH₂PO4(s) and 28.0 g of Na₂HPO4(s) in water and then diluting to 1.00 L. pH =
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Step 1

Phosphoric acid is a triprotic acid. Given Ka1 , Ka2 and Ka3 values. 

To find the pH of a buffer composed of H2PO4– and HPO42– . We have to find which pKa values should be used in the Henderson-Hassechblach equation.

 

pH of the buffer solution is to be calculate which composed of 17g KH2PO4 and 28 g Na2HPO4 in 1 litre water.

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