Chemistry: The Central Science (13th Edition)

by Brown, Theodore E.; LeMay, H. Eugene; Bursten, Bruce E.; Murphy, Catherine; Woodward, Patrick; Stoltzfus, Matthew E.

Published by Prentice Hall

ISBN 10: 0321910419

ISBN 13: 978-0-32191-041-7

Chapter 16 - Acid-Base Equilibria - Exercises - Page 716: 16.7b

Answer

Molecule B

Work Step by Step

Molecule B is a carboxylic acid because it contains a carboxyl group (-COOH). Since O is very electronegative, it pulls the electron from the H, allowing for the H to have a more positive charge. As a result, the H ionizes more easily, forming $H_{3}O+$ in solution. This means that molecule B is a H+ donor, so it behaves as a Brønsted-Lowry acid.

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