Video: PKa hais li cas txog acid zog?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Muaj zog kua qaub yog txhais los ntawm lawv pKa . Cov kua qaub yuav tsum muaj zog nyob rau hauv aqueous tov tshaj hydronium ion, yog li nws pKa yuav tsum qis dua li ntawm hydronium ion. Yog li ntawd, muaj zog kua qaub muaj a pKa ntawm <-174.
Yog li ntawd, pKa qhia koj li cas txog lub zog ntawm cov kua qaub?
Cov ntsiab lus tseem ceeb: pKa Lus Txhais The pKa tus nqi yog ib txoj kev siv los qhia qhov lub zog ntawm ib tug acid . pKa yog lub log tsis zoo ntawm lub kua qaub dissociation tas li los yog Ka tus nqi. Ib qho qis pKa tus nqi qhia tias muaj zog dua kua qaub . Ntawd yog, tus nqi qis dua qhia qhov kua qaub ntau dissociates nyob rau hauv dej.
Qhov thib ob, dab tsi yog txhais los ntawm lub zog ntawm cov kua qaub? Acid zog hais txog qhov nyiam ntawm ib qho kua qaub , cim los ntawm cov tshuaj formula HA, kom dissociate rau hauv ib tug proton, H+, thiab anion, A−. Lub dissociation ntawm ib tug muaj zog kua qaub nyob rau hauv kev daws yog zoo tiav, tshwj tsis yog nyob rau hauv nws feem ntau concentrated daws.
Tom qab ntawd, ib tug kuj yuav nug, puas pKa siab txhais tau tias muaj zog acid?
Ib qho qis pKa txhais tau tias tus nqi yog siab dua thiab a siab dua Ka nqi txhais tau tias kua qaub dissociates yooj yim dua vim hais tias nws muaj ib tug loj concentration ntawm Hydronium ions (H3O+).
Dab tsi yog pKa ntawm cov kua qaub tsis muaj zog?
Yog li ntawd, pKa tau qhia raws li qhov ntsuas los qhia txog acidity ntawm tsis muaj zog acids , qhov twg pKa yog txhais raws li nram no. Piv txwv li, Ka tas li rau acetic kua qaub (CH3TZS) is 0.0000158 (= 10-4.8), tab sis pKa qhov tsis tu ncua yog 4.8, uas yog ib qho yooj yim qhia. Tsis tas li ntawd, qhov me me pKa tus nqi, lub zog kua qaub.
Pom zoo:
Vim li cas peb thiaj li hais txog kev txwv tsis pub muaj kev hais tawm thiab thaum twg peb yuav hais cov kev txwv?
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