Chemistry: Molecular Approach (4th Edition)

Published by Pearson
ISBN 10: 0134112830
ISBN 13: 978-0-13411-283-1

Chapter 16 - Exercises - Page 771: 24


Conjugate acids of weak bases like $N{H_4}^+$ and $CH_3N{H_3}^+$ act as weak acids. Other type of cations that also act as weak acids are small, highly charged metals, like $Fe^{3+}$ and $Al^{3+}$.

Work Step by Step

Any cation that is the conjugate acid of a weak base can act as a weak acid according to the generic equation: $$BH^+(aq) + H_2O(l) \leftrightharpoons H_3O^+(aq) + B(aq)$$ Small, highly charged metals react with water to become hydrated, and then act as Bronsted-Lowry acids. Example: $$Fe(H_2O{)_6}^{3+} + H_2O (l) \leftrightharpoons Fe(H_2O)_5(OH)^{2+}(aq) + H_3O^+(aq)$$
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