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Koj ua pov thawj li cas Henderson Hasselbalch kab zauv?
Koj ua pov thawj li cas Henderson Hasselbalch kab zauv?

Video: Koj ua pov thawj li cas Henderson Hasselbalch kab zauv?

Video: Koj ua pov thawj li cas Henderson Hasselbalch kab zauv?
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Deriving Henderson-Hasselbalch Equation

  1. Siv cov tshuaj tiv thaiv ionization ntawm cov kua qaub tsis muaj zog (HA):
  2. Lub dissociation tas li Ka ntawm cov lus teb saum toj no yuav yog:
  3. Tom qab ntawd los ntawm kev sib npaug (2) tshem tawm [H?] mus rau sab laug (daws rau H?):
  4. Hloov cov pH thiab pKa hauv lub kev sib npaug (4):

Ib yam li ntawd, Henderson equation hauv chemistry yog dab tsi?

Kho tshiab Lub yim hli ntuj 10, 2019. The Henderson Hasselbalch kev sib npaug yog kwv yees kev sib npaug uas qhia txog kev sib raug zoo ntawm pH lossis pOH ntawm kev daws thiab pKa lub pkb thiab qhov ratio ntawm cov concentrations ntawm dissociated tshuaj hom.

Ib yam li ntawd, 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.

Ua raws li qhov xav tau, pKa formula yog dab tsi?

pKa yog txhais li -log10 Ka qhov twg Ka = [H+[A-] / [HA]. Los ntawm cov kab lus no nws muaj peev xwm muab tau Henderson-Hasselbalch kev sib npaug uas yog. pKa = pH + log [HA] / [A-] Qhov no qhia peb tias thaum pH = pKa then log [HA] / [A-] = 0 so [HA] = [A-] piv txwv li qhov sib npaug ntawm ob daim ntawv.

Puas yog dej tsis haum?

Dej yog a tsis pub txawm yog tus pluag. Qhov no yog vim H20 pom ionises los ua H30+ thiab OH-. Tsim kom muaj acidic buffer tsis koj xav tau ib tug qaug zog acid nrog lub conjugate puag. Raws li yuav muaj hydronium thiab hydroxide ions tam sim no yog nws ua raws li ib tug tsis pub tab sis yog ib qho txaus ntshai.

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