A chemistry graduate student is given 125. mL of a 0.30M benzoic acid (HC H,CO,) solution. Benzoic acid is a weak acid with K = 6.3 × 10 -5 What mass of KC,H,CO, should the student dissolve in the HC H,CO, solution to turn it a into a buffer with pH = 3.97? You may assume that the volume of the solution doesn't change when the KC,H,CO, is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits.

Chemistry & Chemical Reactivity
9th Edition
ISBN:9781133949640
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 125. mL of a 0.30 M benzoic acid (HC,
H;CO,) solution. Benzoic acid is a weak
5
acid with K, = 6.3 × 10 °. What mass of KC,H,CO, should the student dissolve in the HCH,CO, solution to turn it
5.
into a buffer with pH = 3.97?
You may assume that the volume of the solution doesn't change when the KC,H,CO, is dissolved in it. Be sure your
answer has a unit symbol, and round it to 2 significant digits.
Transcribed Image Text:A chemistry graduate student is given 125. mL of a 0.30 M benzoic acid (HC, H;CO,) solution. Benzoic acid is a weak 5 acid with K, = 6.3 × 10 °. What mass of KC,H,CO, should the student dissolve in the HCH,CO, solution to turn it 5. into a buffer with pH = 3.97? You may assume that the volume of the solution doesn't change when the KC,H,CO, is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits.
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