## Chemistry: The Molecular Science (5th Edition)

$HClO_3$ is a stronger acid.
Since the central atoms are different for the molecules, we can compare them. - The electronegativity of the central atom is a factor that affects the strength. The more electronegative atom makes the stronger oxoacids. Therefore, since "$Cl$" is more electronegative than "$P$", $HClO_3$ is a stronger acid.