<prompt> Tarisa ndima iri pasi apa uye wozopindura mubvunzo unotevera mumutauro mumwechetewo: Passage: Aspirin, is acetyl derivative ye salicylic acid, is white, crystalline, weakly acidic substance, with a melting point of 136 C 277 F, and a boiling point of 140 C 284 F. Its acid dissociation constant pKa is 3.5 at 25 C 77 F. Mubvunzo: Chii chinonzi acid dissociation muCelsius?  <response>: 25 C 