At a certain temperature, the percent dissociation (ionization) of chlorous acid, HClO₂, in a 1.53 M solution of water is 10.0%. Calculate the value of Ka for chlorous acid at this temperature.
a) 1.7 x 10⁻²
b) 2.5 x 10⁻³
c) 5.0 x 10⁻³
d) 8.0 x 10⁻³