The acid HD has a pKa of 4.64.  What volume, in mL, of a 0.100 M solution of sodium hydroxide needs to be added to 40.00 mL of a 0.100 M solution of the acid solution to make a buffer with a pH of 4.91?

Chemistry: The Molecular Science
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ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
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Chapter15: Additional Aqueous Equilibria
Section: Chapter Questions
Problem 93QRT: When 40.00 mL of a weak monoprotic acid solution is titrated with 0.100-M NaOH, the equivalence...
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The acid HD has a pKa of 4.64.  What volume, in mL, of a 0.100 M solution of sodium hydroxide needs to be added to 40.00 mL of a 0.100 M solution of the acid solution to make a buffer with a pH of 4.91?

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