Qhov no txhais tau hais tias thaum pH sib npaug rau pKa muaj qhov sib npaug ntawm cov protonated thiab deprotonated cov ntaub ntawv ntawm cov kua qaub. Piv txwv li, yog tias pKa ntawm cov kua qaub yog 4.75, ntawm pH ntawm 4.75 cov kua qaub yuav tshwm sim li 50% protonated thiab 50% deprotonated.
pKa cuam tshuam li cas rau pH?
PKa yog tus nqi pH uas ib hom tshuaj yuav txais lossis pub dawb rau proton. Qhov qis dua pKa, cov kua qaub muaj zog dua thiab muaj peev xwm pub dawb proton ntau dua hauv cov tshuaj aqueous.
PH pKa thaum twg?
At the half-equivalence point, pH=pKa thaum titrating a weak acid. Tom qab qhov sib npaug taw tes, cov tshuaj tiv thaiv stoichiometric tau neutralized tag nrho cov qauv, thiab pH nyob ntawm seb ntau npaum li cas titrant tau ntxiv. Tom qab qhov sib npaug ntawm qhov sib npaug, txhua lub hauv paus muaj zog KOH txiav txim siab pH.
Yuav ua li cas thaum pH ze rau pKa?
Nco ntsoov tias thaum pH sib npaug rau pKa tus nqi, qhov kev faib ua feem ntawm conjugate puag thiab conjugate acid yog sib npaugRaws li pH nce, qhov kev faib ua feem ntawm conjugate pib nce thiab predominates. … Yog hais tias pH tsawg kawg yog 2.0 pH units hauv qab pKa, ces cov conjugate acid yog tsawg kawg yog 99% ntawm tag nrho.
Yuav tsum pKa ze rau pH?
Qhov sib npaug ntawm Henderson-Hasselbalch tuaj yeem pab peb xaiv qhov tsis muaj pH uas peb xav tau. Nrog rau qhov sib npaug ntawm conjugate acid thiab base (nyiam dua yog li buffers tuaj yeem tiv taus lub hauv paus thiab acid sib npaug), ces … Yog li xaiv cov conjugates nrog pKa ze tshaj raupeb lub hom phiaj pH. Piv txwv: Koj xav tau qhov tsis muaj pH ntawm 7.80.