Chemistry: The Molecular Science (5th Edition)

by Moore, John W.; Stanitski, Conrad L.

Published by Cengage Learning

ISBN 10: 1285199049

ISBN 13: 978-1-28519-904-7

Chapter 14 - Acids and Bases - Questions for Review and Thought - General Questions - Page 652e: 94b

Answer

The weakest acid in this list is $HS^-$.

Work Step by Step

- Identify the compound with the lowest $K_a$ value. It is the $HS^-$, with a $K_a = 1 \times 10^{-19}$ This compound is the weakest of the list, because the $K_a$ measures the strength of the acid.

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