Answer
A
Work Step by Step
pKa = 4.20 means that the $Ka=6.31\times10^{-5}$
From the table that's benzoic acid.
Chemistry and Chemical Reactivity (9th Edition)
by Kotz, John C.; Treichel, Paul M.; Townsend, John R.; Treichel, David A.
Published by
Cengage Learning
ISBN 10:
1133949649
ISBN 13:
978-1-13394-964-0
Chapter 16 Principles of Chemical Reactivity: The Chemistry of Acids and Bases - 16-3 Equilibrium Constants for Acids and Bases - Review & Check for Section 16-3 - Page 598: 3
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