<prompt> Rangarira ndima iri pasi apa uye ipapo pindura mubvunzo gare gare mumutauro mumwe chetewo sechikamu: Passage: Aspirin, acetyl rinobva salicylic acid, iri chena, crystalline, simba acidic fuma, ane utsotso pfungwa 136 C 277 F, uye boiling pfungwa 140 C 284 F. Iyo acid dissociation constant pKa ndeye 3.5 pa 25 C 77 F. Mubvunzo: Chii chinonzi acid dissociation muCelsius?  <response>: 25 C 