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A chemistry graduate student is given 125. mL of a 0.30M pyridine (CHN) solution. Pyridine is a weak base with K = 1.7 × 10 . What mass of CH3NHBr should the student dissolve in the C,H-N solution to turn it into a buffer with pH =5.09? You may assume that the volume of the solution doesn't change when the C,H-NHBr is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits. x10 X

A chemistry graduate student is given 125. mL of a 0.30M pyridine (CHN) solution. Pyridine is a weak base with K = 1.7 × 10 . What mass of CH3NHBr should the student dissolve in the C,H-N solution to turn it into a buffer with pH =5.09? You may assume that the volume of the solution doesn't change when the C,H-NHBr is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits. x10 X

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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**Buffer Solution Calculation** A chemistry graduate student is given 125. mL of a 0.30 M pyridine (\(C_5H_5N\)) solution. Pyridine is a weak base with \(K_b = 1.7 \times 10^{-9}\). What mass of \(C_5H_5NHBr\) should the student dissolve in the \(C_5H_5N\) solution to turn it into a buffer with pH = 5.09? You may assume that the volume of the solution doesn't change when the \(C_5H_5NHBr\) is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits. --- **Input Box Description** The image contains two interactive input boxes. The first box is a simple text field for numerical input. The second box includes a square selection option for scientific notation (\( \times 10 \)) and two buttons: a checkmark for confirming the answer and a circular arrow for resetting the input.
Transcribed Image Text:**Buffer Solution Calculation** A chemistry graduate student is given 125. mL of a 0.30 M pyridine (\(C_5H_5N\)) solution. Pyridine is a weak base with \(K_b = 1.7 \times 10^{-9}\). What mass of \(C_5H_5NHBr\) should the student dissolve in the \(C_5H_5N\) solution to turn it into a buffer with pH = 5.09? You may assume that the volume of the solution doesn't change when the \(C_5H_5NHBr\) is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits. --- **Input Box Description** The image contains two interactive input boxes. The first box is a simple text field for numerical input. The second box includes a square selection option for scientific notation (\( \times 10 \)) and two buttons: a checkmark for confirming the answer and a circular arrow for resetting the input.
Expert Solution
Step 1: Consider the given information:

The concentration of pyridine = 0.30 M

The Kb for pyridine = 1.7 cross times 10 to the power of negative 9 end exponent

Mass of straight C subscript 5 straight H subscript 5 NHBr = ?

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