Question

You discovered a new diprotic acid, which you have named edmontonic acid. You want to characterize the pKa’s of edmontonic acid, so you perform a titration experiment. Your data are summarized in the table below. Your titration sample contains 150 mmol of edmontonic acid.


amount NaOH added (mmol) 180.0 and pH 4.168
amount of NaOH added 405.0
and pH 6.758

Determine the pKa’s of edmontonic acid. Show your work. (5)