Chemistry 12th Edition

Published by McGraw-Hill Education
ISBN 10: 0078021510
ISBN 13: 978-0-07802-151-0

Chapter 15 - Acids and Bases - Questions & Problems - Page 712: 15.61


Diprotic acids are capable of donating 2 protons to the solution, and carbonic acid ($H_2CO_3$) is an example.

Work Step by Step

When a diprotic acid is added to a solution, it will happen this reaction: $H_2A(aq) + H_2O(l) HA^-(aq) + H_3O^+(aq)$ But, that doesn't stop there, because $HA^-$ is capable of donating a proton too, and that makes $H_2A$ as diprotic acid. $HA^-(aq) + H_2O(l) A^{2-}(aq) + H_3O^+(aq)$ ** The second reaction happens in a lesser quantity.
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