Cov ntsuas yog cov khoom uas nws cov tshuaj hloov xim vim hloov pauv hauv pH Cov no yog cov cim ntsuas kua qaub. Lawv feem ntau yog cov acids tsis muaj zog lossis cov hauv paus, tab sis lawv lub hauv paus conjugate conjugate puag Rau cov dej aqueous ntawm cov kua qaub tsis muaj zog, qhov kev sib cais tsis tu ncua yog hu ua acid ionization tas li (Ka). Ib yam li ntawd, qhov sib npaug tas li rau cov tshuaj tiv thaiv ntawm lub hauv paus tsis muaj zog nrog dej yog lub hauv paus ionization tas li (Kb). Rau tej conjugate acid–base khub, KaKb=Kw. https://chem.libretexts.org › 07:_Acid_and_Base_Equilibria
7.12: Kev sib raug zoo ntawm Ka, Kb, pKa, thiab pKb - Chemistry LibreTexts
lossis cov ntawv kua qaub muaj xim sib txawv vim qhov sib txawv ntawm lawv qhov nqus dej.
nws hu li cas thaum qhov ntsuas hloov xim?
Qhov sib npaug, lossis stoichiometric point, ntawm cov tshuaj tiv thaiv tshuaj yog qhov taw qhia ntawm cov tshuaj sib npaug ntawm cov tshuaj reactants tau tov. … Qhov kawg (xws li, tab sis tsis zoo ib yam li qhov sib npaug taw tes) yog hais txog qhov taw tes uas qhov taw qhia hloov xim nyob rau hauv ib tug colorimetric titration.
Do cov ntsuas hloov xim ntawm pKa?
pKa ntawm cov ntsuas
Qhov tshwm sim ntawm cov lus teb no yog qhov ntsuas yuav hloov xim thaum pH yog tib tus nqi raws li nws tus nqi pKa.
Vim li cas cov ntsuas hloov liab?
Phenolphthalein, tus ntsuas acid-base siv los ntsuas pH ntawm cov tshuaj, hloov xim liab vim muaj lub hauv paus tsis muaj zogTxawm tias cov anions liab, cov tshuaj tseem nyob. tsis muaj xim nyob rau hauv lub xub ntiag ntawm ib tug acid. Yog tias pH ntawm cov tshuaj yog 8.2 lossis siab dua, tus naj npawb ntawm cov anions nce, ua rau cov tshuaj tig liab.
Vim li cas phenolphthalein liab hauv Xim?
Ua tiav cov kauj ruam los ntawm kev daws teeb meem:
-Phenolphthalein tau dav siv los ua qhov taw qhia hauv acid-base titrations. -Nws hloov tsis muaj xim nyob rau hauv lub xub ntiag ntawm ib tug acid thiab puv liab nyob rau hauv lub xub ntiag ntawm lub hauv paus. … Nws yog vim tsim cov ions uas cov tshuaj hloov xim liab.
