An aqueous solution containing 4 mM of a weak acid (HA) has anabsorbance of 0.72 in a cuvet having an optical pathlength of 1 cm.Assuming that εH ˜ 0, εHA˜ 200 M-1cm-1 and εA-˜ 150 M-1cm-1 at a particular wavelength, determine the acid dissociation constant for HA.