A student prepares a sample of a weak monoprotic acid, \(\text{HA(aq)}\), with a concentration of \(0.20\text{ M}\) and an acid-dissociation constant of \(K_a = 1.8 \times 10^{-5}\) at \(298\text{ K}\). The student then adds an equal volume of distilled water to the solution at constant temperature. Which of the following correctly describes the effect of this dilution on the percent ionization of \(\text{HA}\) and provides the correct justification?