The acid-base indicator hln undergoes the following reaction in dilute aqueous solution: the following absorbance data were ohtained for a 5.00 x iw' m solution of hin in 0.1 m naoh and 0.1 m hci. measurements were made at wavelengths of 485 nm and 625 nm with 1.00·cm cells. 0.1 mnaoh 0.1 mhci am = 0.075 a. s) = 0.487 a62; = 0.904 a62j = 0.181 [n the naoh solution, essentially all of the indicator is present as in ; in the acidic solution, it is essentially all in the form of hin. (a) calculate molar absorption~ities for in - and hin at 485 and 625 nm. (h) calculate the acid dissociation constant for the indicator if a ph 5.00 buffer containing a small amount of the indicator exhibits an absorbance of 0.567 at .+85nm and 0.395 at 625 nm (1.00-cm cells). (c) what is the ph of a solution containing a small amount of the indicator that exhihits an absorbance of 0.492 at 485 nm and 0.2'+5 at 635 nm (l. oo-cm cells)'! (d) a 25.00-ml aliquot of a solution of purified weak organic acid hx required exactly 2.+.20ml of a standard solution of a strong hase to reach a phenolphthalein end point. when exactly 12.10 ml of the hase was added to a second