Chemistry: The Molecular Science (5th Edition)

Published by Cengage Learning
ISBN 10: 1285199049
ISBN 13: 978-1-28519-904-7

Chapter 14 - Acids and Bases - Questions for Review and Thought - Topical Questions - Page 652c: 51b


$H_3AsO_4(aq) + H_2O(l) \lt -- \gt H_2As{O_4}^-(aq) + H_3O^+(aq)$ $H_2As{O_4}^-(aq) + H_2O(l) \lt -- \gt HAs{O_4}^{2-}(aq) + H_3O^+(aq)$ $HAs{O_4}^{2-}(aq) + H_2O(l) \lt -- \gt As{O_4}^{3-}(aq) + H_3O^+(aq)$

Work Step by Step

1. Identify if the compound is a polyprotic acid or base: - $H_3AsO_4$ is an acid. 2. Write the ionization equation for the original acid. - Write an equation where $H_3AsO_4$ donates a proton to a water molecule. 3. Now, for polyprotic acids, the conjugate base is capable of donating one proton too, so write an equation where it does that. - $H_2As{O_4}^-$ can act as an acid too, so write an equation where it donates a proton to a water molecule. - Repeat "Step 3" for the next reaction, until the conjugate base is incapable of donating one proton.
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