Answer
The stronger acid in this list is $HF$.
Work Step by Step
Because it has the greatest $K_a$ value, it is the stronger acid.
$6.8 \times 10^{-4} > 1.8 \times 10^{-5} $
$6.8 \times 10^{-4} > 1 \times 10^{-19}$
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: 94a
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