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9a. Phosphoric acid, H3PO4, is a trivalent acid with pKs1 = 2.12, pKs2 = 7.21, and pK $3 = 12.37. Calculate how many milliliters of 1.50 M HCI should be added to 300 mL of 0.400 M Na₂HPO4 to obtain a buffer solution with pH = 6.85. 9b. To the resulting buffer solution in question 9a, 16.0 mL of 0.500 M NaOH is added. Calculate the pH of the solution after this addition. 9c. When ammonium hydrogen phosphate, (NH4)2HPO4, dissolves in water, the following equilibrium is established: NH +HPO +NH3+H,PO K = 10-2.04 Based on the above equilibrium, calculate the concentrations of HPO and H₂PО in a 0.100 M solution of (NH4)2HPO4. 9d. Calculate the pH of the solution in question 9c. I

9a. Phosphoric acid, H3PO4, is a trivalent acid with pKs1 = 2.12, pKs2 = 7.21, and pK $3 = 12.37. Calculate how many milliliters of 1.50 M HCI should be added to 300 mL of 0.400 M Na₂HPO4 to obtain a buffer solution with pH = 6.85. 9b. To the resulting buffer solution in question 9a, 16.0 mL of 0.500 M NaOH is added. Calculate the pH of the solution after this addition. 9c. When ammonium hydrogen phosphate, (NH4)2HPO4, dissolves in water, the following equilibrium is established: NH +HPO +NH3+H,PO K = 10-2.04 Based on the above equilibrium, calculate the concentrations of HPO and H₂PО in a 0.100 M solution of (NH4)2HPO4. 9d. Calculate the pH of the solution in question 9c. I

General Chemistry - Standalone book (MindTap Course List)
General Chemistry - Standalone book (MindTap Course List)
11th Edition
ISBN:9781305580343
Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Publisher:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Chapter16: Acid-base Equilibria
Section: Chapter Questions
Problem 16.147QP
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9a. Phosphoric acid, H3PO4, is a trivalent acid with pKs1 = 2.12, pKs2 = 7.21, and pK $3 = 12.37. Calculate how many milliliters of 1.50 M HCI should be added to 300 mL of 0.400 M Na₂HPO4 to obtain a buffer solution with pH = 6.85. 9b. To the resulting buffer solution in question 9a, 16.0 mL of 0.500 M NaOH is added. Calculate the pH of the solution after this addition. 9c. When ammonium hydrogen phosphate, (NH4)2HPO4, dissolves in water, the following equilibrium is established: NH +HPO +NH3+H,PO K = 10-2.04 Based on the above equilibrium, calculate the concentrations of HPO and H₂PО in a 0.100 M solution of (NH4)2HPO4. 9d. Calculate the pH of the solution in question 9c. I
Transcribed Image Text:9a. Phosphoric acid, H3PO4, is a trivalent acid with pKs1 = 2.12, pKs2 = 7.21, and pK $3 = 12.37. Calculate how many milliliters of 1.50 M HCI should be added to 300 mL of 0.400 M Na₂HPO4 to obtain a buffer solution with pH = 6.85. 9b. To the resulting buffer solution in question 9a, 16.0 mL of 0.500 M NaOH is added. Calculate the pH of the solution after this addition. 9c. When ammonium hydrogen phosphate, (NH4)2HPO4, dissolves in water, the following equilibrium is established: NH +HPO +NH3+H,PO K = 10-2.04 Based on the above equilibrium, calculate the concentrations of HPO and H₂PО in a 0.100 M solution of (NH4)2HPO4. 9d. Calculate the pH of the solution in question 9c. I
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