What concentration of NaF do you need to add to a 0.15M HF solution to get a buffer solution pH of 9.5? The Ka for HF is 7.4x10-4?

Chemistry by OpenStax (2015-05-04)
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ISBN:9781938168390
Author:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Publisher:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Chapter14: Acid-base Equilibria
Section: Chapter Questions
Problem 100E: What mass of NH4Cl must be added to 0.750 L of a 0.100-M solution of NH3 to give a buffer solution...
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What concentration of NaF do you need to add to a 0.15M HF solution to get a buffer solution pH of 9.5? The Ka for HF is 7.4x10-4?
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