A proton is transferred from an unspecified Brønsted acid to ammonia, a Brønsted base; alternatively, ammonia acts as a Lewis base and transfers a lone pair of electrons to form a bond with a hydrogen ion.
ɐ pɹˈoʊtɑːn ɪz tɹænsfˈɜːd fɹʌm ɐn ʌnspˈɛsᵻfˌaɪd bɹˈɑːnstᵻd ˈæsɪd tʊ æmˈoʊniə, ɐ bɹˈɑːnstᵻd bˈeɪs; ɔːltˈɜːnətˌɪvli, æmˈoʊniə ˈækts æz ɐ lˈuːɪs bˈeɪs ænd tɹˈænsfɜːz ɐ lˈoʊn pˈɛɹ ʌv ᵻlˈɛktɹɑːnz tə fˈɔːɹm ɐ bˈɑːnd wɪð ɐ hˈaɪdɹədʒən ˈaɪɑːn.