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, how many grams each of NaH2PO4 and Na2HPO4 must be dissolved in enough water to make 1.0 L of solution whose pH = 7.2? If the final concentration of NaH2PO4 is 0.1 M.

World of Chemistry, 3rd edition
3rd Edition
ISBN:9781133109655
Author:Steven S. Zumdahl, Susan L. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan L. Zumdahl, Donald J. DeCoste
Chapter16: Acids And Bases
Section: Chapter Questions
Problem 5A
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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, how many grams each of NaH2PO4 and Na2HPO4 must be dissolved in enough water to make 1.0 L of solution whose pH = 7.2? If the final concentration of NaH2PO4 is 0.1 M.

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