ɪnðə spˈɛʃəl kˈeɪs ʌv ˈeɪkwɪəs səlˈuːʃənz, pɹˈoʊtɑːn dˈoʊnɚz fˈɔːɹm ðə haɪdɹˈoʊniəm ˈaɪɑːn ˈeɪtʃ θɹˈiː ˈoʊ plˈʌs ænd ɑːɹ nˈoʊn æz ɚrhˈiːnɪəs ˈæsɪdz.
In the special case of aqueous solutions, proton donors form the hydronium ion H3O+ and are known as Arrhenius acids.