A chemistry graduate student is given 450. mL of a 0.70.M pyridine (C5H5N) solution. Pyridine is a weak base with Kb = 1.7 × 10-9. What mass of C5H5NHBr should the student dissolve in the C5H5N solution to turn it into a buffer with pH = 5.63? 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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Chapter1: Chemical Foundations
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A chemistry graduate student is given 450. mL of a 0.70.M pyridine (C5H5N) solution. Pyridine is a weak base with Kb = 1.7 × 10-9. What mass of C5H5NHBr should the student dissolve in the C5H5N solution to turn it into a buffer with pH = 5.63? 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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