A 250.0-mL buffer solution initially contains 0.020 M of HCHO2 and 0.020 M of NaCHO2 . Ka(HCHO2)=1.8×10−4 . Part A Part complete In order to adjust the buffer pH to 4.20, should you add NaOH or HCl to the buffer mixture? Part B What mass of the correct reagent should you add?

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 250.0-mL buffer solution initially contains 0.020 M of HCHO2 and 0.020 M of NaCHO2 . Ka(HCHO2)=1.8×10−4 . Part A Part complete In order to adjust the buffer pH to 4.20, should you add NaOH or HCl to the buffer mixture? Part B What mass of the correct reagent should you add?
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