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