Video: Vim li cas qhov tsis tuaj yeem ua haujlwm zoo tshaj plaws ntawm pH ze nws pKa?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Hauv lwm lo lus, lub pH Qhov sib npaug ntawm cov kua qaub (piv txwv li, thaum qhov sib piv ntawm qhov concentration ntawm acid thiab conjugate puag yog 1: 1) yog sib npaug rau pKa . Cov cheeb tsam no yog qhov zoo tshaj plaws los tiv thaiv kev hloov pauv loj hauv pH thaum ntxiv acid los yog base ntxiv. Ib qho titration nkhaus visually pom tsis pub muaj peev xwm.
Tsis tas li ntawd, nyob rau hauv dab tsi thaj tsam ntawm pH yog qhov tsis zoo tshaj plaws?
Buffers feem ntau yog zoo dhau ntawm ntau pH = pKib ± 1. Cov ammonia tsis pub yuav yog siv tau nruab nrab pH = 8.24 – 10.24 TZS Cov acetate tsis pub yuav yog siv tau ntawm pH ntau los ntawm 3.74 rau 5.74. Sab nraud ntawm cov no thaj tsam , kev daws tsis tuaj yeem tiv thaiv kev hloov pauv hauv pH los ntawm ntxiv muaj zog acids los yog bases.
Ib yam li ntawd, kev sib raug zoo ntawm pKa thiab qhov muaj txiaj ntsig ntawm qhov tsis yog dab tsi? Lus txhais: A tsis pub yog ib qho kev daws teeb meem uas tiv thaiv kev hloov pauv tseem ceeb hauv pH thaum ntxiv cov kua qaub lossis lub hauv paus. Rau ib qho tsis muaj zog acid / conjugate puag khub, lub buffering ntau yam yog nws pKa +1. Ib qho molecule uas muaj ionizing pawg nrog ob qho tib si acidic thiab yooj yim pKa Qhov tseem ceeb yog hu ua ampholyte.
Tom qab ntawd, ib tug kuj yuav nug, vim li cas lub buffer ua nws txoj hauj lwm zoo tshaj plaws ntawm nws pKa?
Cov peev a tsis pub kev daws teeb meem kom tswj tau qhov pH tas li thaum me me ntawm cov kua qaub los yog hauv paus yog ntxiv rau tus daws yog loj tshaj ntawm pka ua thiab diminishes li tus pH ntawm tus kev daws mus saum toj lossis hauv qab pka ua.
Thaum xaiv pH tsis rau qhov kev sim Yuav ua li cas kaw qhov pKa ntawm qhov tsis yog los ntawm qhov xav tau pH ntawm qhov kev sim?
(1) Cov pKa ntawm lub buffer yuav tsum ua nyob ze tus xav tau qhov nruab nrab pH ntawm qhov kev daws teeb meem. (2) Lub peev xwm ntawm a tsis yuav tsum poob hauv ib mus rau ob pH units saum toj no lossis hauv qab xav pH tus nqi. Yog tias pH xav tias yuav poob thaum lub sijhawm ua haujlwm, xaiv ib tsis pub nrog a pKa me ntsis qis dua qhov nruab nrab pH.
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