If the pH at the 1/2 equivalence point is 4.19, what would be the Ka?

Chemistry: Principles and Reactions
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ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:William L. Masterton, Cecile N. Hurley
Chapter14: Equilibria In Acid-base Solutions
Section: Chapter Questions
Problem 52QAP: A solution is prepared by dissolving 0.350 g of benzoic acid, HC7H5O2, in water to make 100.0 mL of...
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If the pH at the 1/2 equivalence point is 4.19, what would be the Ka?

The 1/2 equivalence point is defined as the point at which 1/2 of the volume needed to reach the equivalence point has been added in a
weak acid or weak base titration. Also at the 1/2 equivalence point, the pH = pKa of the weak acid or weak base (p = - log). When titrating
acetic acid with potassium hydroxide, it took 19.24 mL of KOH to reach the equivalence point, where the pH was determined to be 8.58.
The volume needed to reach the 1/2 equivalence point is
Transcribed Image Text:The 1/2 equivalence point is defined as the point at which 1/2 of the volume needed to reach the equivalence point has been added in a weak acid or weak base titration. Also at the 1/2 equivalence point, the pH = pKa of the weak acid or weak base (p = - log). When titrating acetic acid with potassium hydroxide, it took 19.24 mL of KOH to reach the equivalence point, where the pH was determined to be 8.58. The volume needed to reach the 1/2 equivalence point is
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