<prompt> Bheka isigaba esingezansi bese uphendula umbuzo emva kwalokho ngolimi olufanayo nesigaba: I-Aspirin, i-acetyl derivative ye-salicylic acid, iyinto emhlophe, ekhanyayo, enama-acid amancane, enendawo yokuncibilika engu-136 C 277 F, nephuzu lokubilisa elingu-140 C 284 F. I-constant yayo yokuhlukaniswa kwe-acid pKa ingu-3.5 ku-25 C 77 F. Umbuzo: Iyini i-acid dissociation ngo-Celsius?  <response>: 25 C 