All three protons can be successively lost to yield H2PO, then HPO, and finally PO, the orthophosphate ion, usually just called phosphate.
ˈɔːl θɹˈiː pɹˈoʊtɑːnz kæn biː səksˈɛsɪvli lˈɔst tə jˈiːld ˈeɪtʃ tˈuː pˌiːˈoʊ, ðˈɛn ˌeɪtʃpˌiːˈoʊ, ænd fˈaɪnəli pˌiːˈoʊ, ðɪ ˈɔːɹθəfˌɑːsfeɪt ˈaɪɑːn, jˈuːʒuːəli dʒˈʌst kˈɔːld fˈɑːsfeɪt.