A chemistry graduate student is given 300.mL of a 1.10M hydrocyanic acid  (HCN) solution. Hydrocyanic acid is a weak acid with =Ka×4.9*10^−10. What mass of NaCN should the student dissolve in the HCN solution to turn it into a buffer with pH =9.24? You may assume that the volume of the solution doesn't change when the  NaCN is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits.

Chemistry & Chemical Reactivity
10th Edition
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter17: Principles Of Chemical Reactivity: Other Aspects Of Aqueous Equilibria
Section: Chapter Questions
Problem 89GQ: A buffer solution is prepared by dissolving 1.50 g each of benzoic acid, C6H5CO2H, and sodium...
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A chemistry graduate student is given 300.mL of a 1.10M hydrocyanic acid 

(HCN) solution. Hydrocyanic acid is a weak acid with =Ka×4.9*10^−10. What mass of NaCN should the student dissolve in the HCN solution to turn it into a buffer with pH =9.24?

You may assume that the volume of the solution doesn't change when the 

NaCN is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits.

 

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