The pKa of NaH2PO4 is 6.86. Its conjugate base is Na2HPO4. One dissolves 5.0 grams each of NaH2PO4 and Na2HPO4 in 500.0 mL of water. What would be the pH of this buffer? The pKa of NH4Cl is 9.2. Its conjugate base is NH3. One has two stock solutions. One is 0.1 M NH4Cl and the other is 0.1 M NH3. How many mL of each solution must one mix to make 500 mL of a solution which has pH = 9.5?

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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

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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The pKa of NaH₂PO₄ is 6.86. Its conjugate base is Na₂HPO₄. One dissolves 5.0 grams each of NaH₂PO₄ and Na₂HPO₄ in 500.0 mL of water. What would be the pH of this buffer?

The pKa of NH₄Cl is 9.2. Its conjugate base is NH₃. One has two stock solutions. One is 0.1 M NH₄Cl and the other is 0.1 M NH₃. How many mL of each solution must one mix to make 500 mL of a solution which has pH = 9.5?

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