A chemistry graduate student is given 300.mL of a 0.50M pyridine C5H5N solution. Pyridine is a weak base with Kb = 1.7x10^−9. What mass of C5H5NHBr should the student dissolve in the C5H5N solution to turn it into a buffer with pH =5.54?

Chemistry: Principles and Reactions
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Author:William L. Masterton, Cecile N. Hurley
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Chapter14: Equilibria In Acid-base Solutions
Section: Chapter Questions
Problem 26QAP: You want to make a buffer with a pH of 10.00 from NH4+/NH3. (a) What must the [ NH4+ ]/[ NH3 ]ratio...
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3.) A chemistry graduate student is given 300.mL of a 0.50M pyridine C5H5N solution. Pyridine is a weak base with Kb = 1.7x10^−9. What mass of C5H5NHBr should the student dissolve in the C5H5N solution to turn it into a buffer with pH =5.54?

You may assume that the volume of the solution doesn't change when the C5H5NHBr is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits.

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