Lub buffer Khan Academy yog dab tsi?
Lub buffer Khan Academy yog dab tsi?

Video: Lub buffer Khan Academy yog dab tsi?

Video: Lub buffer Khan Academy yog dab tsi?
Video: What is arthritis? | Muscular-skeletal diseases | NCLEX-RN | Khan Academy 2024, Kaum ib hlis
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Hais txog Kev Sau Ntawv. Ib qho kev daws teeb meem tsis muaj qhov sib xyaw ntawm cov kua qaub tsis muaj zog thiab nws lub hauv paus conjugate ( los yog lub hauv paus tsis muaj zog thiab nws cov conjugate acid). Qhov sib npaug ntawm cov kua qaub tsis muaj zog thiab nws lub hauv paus conjugate tso cai rau kev daws teeb meem los tiv thaiv kev hloov pauv ntawm pH thaum me me ntawm cov kua qaub muaj zog lossis cov hauv paus ntxiv.

Kuj paub, dab tsi yog qhov tsis nyob hauv titration?

A tsis pub yog ib qho kev daws teeb meem uas tuaj yeem tiv thaiv pH hloov thaum ntxiv cov kua qaub lossis cov khoom siv hauv paus. Nws muaj peev xwm neutralize me me ntawm cov kua qaub ntxiv los yog hauv paus, yog li tswj cov pH ntawm cov tshuaj kuj ruaj khov. Thumbnail: Simulated titration ntawm ib qho acidified tov ntawm ib tug qaug zog acid (pKa = 4.7) nrog alkali.

Kuj Paub, vim li cas qhov tsis zoo tshaj plaws hauv nws cov pKa? Lub peev xwm ntawm a tsis daws kom tswj tau qhov pH yuav luag tas li thaum ib qho me me ntawm cov kua qaub los yog cov hauv paus ntxiv rau cov tshuaj yog qhov loj tshaj ntawm qhov pKa thiab diminishes raws li pH ntawm cov tshuaj mus rau saum toj los yog hauv qab lub pKa.

Qhov thib ob, qhov sib npaug tsis yog dab tsi?

Qhov sib npaug kev sib npaug rau a tsis pub yog: HA⇌H++ A- Lub zog ntawm cov kua qaub tsis muaj zog feem ntau yog sawv cev raws li qhov sib npaug. Lub acid-dissociation equilibrium tas li (Ka), uas ntsuas qhov propensity ntawm cov kua qaub rau dissociate, rau cov tshuaj tiv thaiv yog: Ka = [H+][A−][HA]

pKa txhais li cas?

Cov ntsiab lus tseem ceeb: pKa txhais Cov pKa tus nqi yog ib txoj kev siv rau qhia lub zog ntawm ib tug acid. pKa yog lub cav tsis zoo ntawm cov kua qaub dissociation tas li los yog Ka tus nqi. Ib qho qis pKa tus nqi qhia tias muaj zog acid. Ntawd yog, tus nqi qis dua qhia tias cov kua qaub ntau dissociates hauv dej.

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