Advanced Placement (AP), 23.03.2020 03:05 21schraderlily
Remember from the buffering capacity note, tell me which of the following acids(and their salts) can make the best buffered solution to maintain the pH as close to 4.30 as possible.
a. Chloroacetic acid (Ka = 1.35 x 10^-3)
b. Propanoic acid (Ka = 1.30 x 10^-5)
c. Benzoic acid (Ka = 6.40 x 10^-5)
d. Hypochlorous acid (Ka = 3.50 x 10^-8)
Hint:
Calculate the required concentration of hyrogen ions from pH 4.30 (use antilog function of your calculator)
You, now, know [H+] and Ka values of each acid. Plug in the formula
Ka = [H+] [A-] / [HA] , and solve for the ratio [HA] / [A-]. The acid with the
ratio [HA] / [A-] closest to 1 is the best (why?)
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