257. Make a 1.0 L of a 0.10 M sodium phosphate buffer at pH = 7.8.Stock solutions are H2PO4- = 1.0 M and NaOH = 2.0 M, pKa H2PO4- = 7.2.258. To this sodium phosphate buffered solution, 5.0 mL of 4.00 M NaOH is added. What is thefinal pH? The pKa of HPO42- is 12.a. 6.0b. 6.5c. 7.0d. 7.5

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Make a 1.0 L of a 0.10 M sodium phosphate buffer at pH = 7.8. ck solutions are H2PO4- = 1.0 M and NaOH = 2.0 M, pKa H2PO4- = 7.2.

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Acid Base Titration

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Question

257. Make a 1.0 L of a 0.10 M sodium phosphate buffer at pH = 7.8.
Stock solutions are H2PO4- = 1.0 M and NaOH = 2.0 M, pKa H2PO4- = 7.2.
258. To this sodium phosphate buffered solution, 5.0 mL of 4.00 M NaOH is added. What is the
final pH? The pKa of HPO42- is 12.
a. 6.0
b. 6.5
c. 7.0
d. 7.5

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Step 2: Determination of concentration of HPO42- and H2PO4-

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Step 3: Preparation of 0.20 M H2PO4- and 0.079 M HPO42- using stock solution

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