sˈɪns ðɛɹˌɑːɹ tˈuː dˈɪfɹənt kˈɑː vˈæljuːz, ðə fˈɜːst mˈɪdpɔɪnt əkˈɜːz æt pˈiː ˈeɪtʃ ˈiːkwəlz pˈiː kˈɑː wˈʌn ænd ðə sˈɛkənd wˈʌn əkˈɜːz æt pˈiː ˈeɪtʃ ˈiːkwəlz pˈiː kˈɑː tˈuː.
Since there are two different Ka values, the first midpoint occurs at pH=pKa1 and the second one occurs at pH=pKa2.