Answer
See the answer below.
Work Step by Step
$pK=-log\ K\rightarrow K=10^{-pK}$
$HCl: K=1.58\times10^{-9}$
$HClO_4: K=5.01\times10^{-6}$
$H_2SO_4: K=1.58\times10^{-7}$
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