Question

Please help, I will give a huge thumbs up:)

An analytical chemist is titrating 105.9 mL of a 0.7000 M solution of butanoic acid (HC3H,CO2) with a 0.5200 M solution of KOH. The pKa of butanoic acid is 4.82. Calculate the pH of the acid solution after the chemist has added 118.1 mL of the KOH solution to it. Note for advanced students: you may assume the final volume equals the initial volume of the solution plus the volume of KOH solution added Round your answer to 2 decimal places A chemistry graduate student is given 125. mL of a 1.60 M pyridine (CgHgN) solution. Pyridine is a weak base with Kb= 1.7 × 10 . What mass of C5H5NHCI should the student dissolve in the C5H5N solution to turn it into a buffer with pH-5.47 You may assume that the volume of the solution doesn't change when the C5H5NHCİ is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits.

Answer 1

6 74 13 61 412 ée 413-61 412 O 61.412 - 12.Ie buffer (Kca l17 ayl 4.82ャ17- 2.mg- 12.718 トに5.4サ 14-5.47 = 853r 13.624 %