Chemistry: The Central Science (13th Edition)

Published by Prentice Hall
ISBN 10: 0321910419
ISBN 13: 978-0-32191-041-7

Chapter 16 - Acid-Base Equilibria - Exercises - Page 720: 16.88d


$H_2C_2O_4$ is stronger than $HC_2{O_4}^-$ because, it is easier to take a proton from a neutral compound than from an anion. And they don't have other difference (besides the hydrogen)

Work Step by Step

This happens because, since the proton $(H^+)$ is positive, it is attracted by the anion, which complicates the donation, decreasing the acidity.
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