Qhov sib txawv tseem ceeb ntawm ib nrab qhov sib npaug ntawm qhov sib npaug thiab qhov sib npaug yog qhov sib npaug ntawm ib nrab yog qhov nruab nrab ntawm qhov pib taw tes thiab qhov sib npaug ntawm qhov sib npaug ntawm qhov sib npaug qhov sib npaug yog qhov twg cov tshuaj tiv thaiv xaus.
Titrations yog cov txheej txheem tshuaj xyuas hauv chemistry uas yog qhov tseem ceeb hauv kev txiav txim siab qhov tsis paub txog cov qauv muab.
Half Equivalence Point yog dab tsi?
Ib nrab qhov sib npaug ntawm qhov kev sib tw yog qhov ib nrab ntawm qhov sib npaug ntawm qhov sib npaug thiab qhov pib (keeb kwm). Qhov tseem ceeb ntawm cov ntsiab lus no yog tias nyob rau lub sijhawm no, pH ntawm cov tshuaj tshuaj ntsuam xyuas yog sib npaug rau qhov sib txawv tsis tu ncua lossis pKa ntawm cov kua qaub uas siv hauv titration. Ib nrab qhov sib npaug taw tes tshwm sim ntawm ib nrab ntim ntawm thawj qhov sib npaug ntawm qhov titration. Yog tias muaj ntau cov ntsiab lus sib npaug hauv qhov titration, muaj ntau qhov sib npaug ib nrab cov ntsiab lus uas sib npaug ntawm cov ntsiab lus sib npaug. Piv txwv li, qhov sib npaug ib nrab thib ob tshwm sim ntawm qhov nruab nrab ntawm qhov sib npaug ntawm thawj thiab thib ob.
Dab tsi yog Equivalence Point?
Qhov sib npaug ntawm qhov sib npaug hauv qhov titration yog qhov taw tes tiag tiag uas qhov xav tau tshuaj tiv thaiv hauv cov tshuaj tiv thaiv sib tov xaus. Peb feem ntau ua titration los txiav txim siab qhov concentration ntawm cov khoom hauv cov kua. Yog tias peb paub cov khoom, titrant (cov tshuaj siv los txiav txim siab qhov concentration ntawm cov khoom sib xyaw hauv cov kua sib tov) uas muaj kev paub txog cov concentration tuaj yeem siv los cuam tshuam nrog cov tshuaj ntsuam xyuas. Ntawm no, peb hu ua titrant raws li tus qauv kev daws teeb meem vim nws qhov tseeb molarity paub.
Daim duab 01: Titration Curve qhia qhov sib npaug Point
Nyob rau hauv cov tshuaj tiv thaiv ntawm NaOH thiab HCl, uas yog cov tshuaj tiv thaiv acid-puag, peb tuaj yeem siv NaOH lossis HCl raws li cov titrant muaj qhov paub txog concentration. Ntawm no, titrant muab tso rau hauv lub burette, thiab maj mam ntxiv nws mus rau titrand / analyte kom txog thaum muaj xim hloov tshwm sim hauv cov tshuaj tiv thaiv sib tov. Peb yuav tsum siv qhov taw qhia vim NaOH thiab HCl tsis yog tus ntsuas tus kheej. Qhov taw tes qhov kev hloov xim tshwm sim yog qhov kawg ntawm qhov titration, uas tsis yog qhov sib npaug ntawm cov tshuaj tiv thaiv.
Nyob rau hauv qhov kev sib tw no, qhov sib npaug ntawm qhov sib npaug yog qhov chaw uas txhua HCl molecules tau hnov mob nrog NaOH (los yog lub ntsiab lus uas txhua NaOH molecules tau hnov mob HCl). Tom qab ntawd cov moles ntawm titrant yuav tsum sib npaug rau cov moles ntawm qhov tsis paub tshuaj ntsuam xyuas txij li lub stoichiometry ntawm HCl thiab NAOH yog 1: 1. Muaj ntau txoj hauv kev los txiav txim qhov sib npaug ntawm qhov titration.
- Xim hloov ntawm tus taw qhia tus kheej - Hauv kev cuam tshuam nrog tus taw qhia tus kheej ua cov tshuaj reactants, cov xim hloov qhia qhov sib npaug ntawm qhov titration vim lawv tsis siv cov ntsuas.
- Endpoint– Qee zaum, qhov sib npaug ntawm qhov sib npaug tuaj yeem raug coj los ua qhov kawg vim tias lawv kwv yees li sib npaug.
- Kev coj ua - Hauv txoj kev no, kev coj ua yog ntsuas thoob plaws hauv titration, thiab qhov sib npaug ntawm qhov sib npaug yog qhov kev hloov pauv sai ntawm kev coj ua. Qhov no yog ib txoj kev nyuaj me ntsis.
- Spectroscopy- Qhov no yog ib txoj hauv kev haum rau cov yeeb yuj tshuaj sib tov. Qhov sib npaug taw tes yog txiav txim siab raws li qhov hloov pauv sai hauv wavelengths uas tau nqus los ntawm tus qauv.
Qhov txawv ntawm Ib Nrab Equivalence Point thiab Equivalence Point yog dab tsi?
Titrations yog cov txheej txheem tshuaj xyuas hauv chemistry uas yog qhov tseem ceeb hauv kev txiav txim siab qhov tsis paub ntau ntawm cov qauv muab. Qhov sib txawv tseem ceeb ntawm ib nrab qhov sib npaug ntawm qhov sib npaug thiab qhov sib npaug ntawm qhov sib npaug yog qhov sib npaug ntawm qhov nruab nrab yog qhov nruab nrab ntawm qhov pib taw tes thiab qhov sib npaug ntawm qhov sib npaug ntawm qhov sib npaug ntawm qhov sib npaug yog qhov twg cov tshuaj tiv thaiv xaus.
Cov ntawv qhia hauv qab no qhia txog qhov sib txawv ntawm ib nrab qhov sib npaug thiab qhov sib npaug.
Summary – Ib nrab Equivalence Point vs Equivalence Point
Titrations yog cov txheej txheem tshuaj xyuas hauv chemistry uas yog qhov tseem ceeb hauv kev txiav txim siab qhov tsis paub ntau ntawm cov qauv muab. Qhov sib txawv tseem ceeb ntawm ib nrab qhov sib npaug ntawm qhov sib npaug thiab qhov sib npaug ntawm qhov sib npaug yog qhov sib npaug ntawm qhov nruab nrab yog qhov nruab nrab ntawm qhov pib taw tes thiab qhov sib npaug ntawm qhov sib npaug ntawm qhov sib npaug ntawm qhov sib npaug yog qhov twg cov tshuaj tiv thaiv xaus.
