For each diprotic acid titration curve, from left to right, there are two midpoints, two equivalence points, and two buffer regions.
fɔːɹ ˈiːtʃ dɪpɹˈɑːɾɪk ˈæsɪd taɪtɹˈeɪʃən kˈɜːv, fɹʌm lˈɛft tə ɹˈaɪt, ðɛɹˌɑːɹ tˈuː mˈɪdpɔɪnts, tˈuː ɪkwˈɪvələns pˈɔɪnts, ænd tˈuː bˈʌfɚ ɹˈiːdʒənz.