Qhov sib txawv tseem ceeb ntawm titration thiab rov qab titration yog tias nyob rau hauv ib qho titration, peb feem ntau ntxiv cov tshuaj sib npaug ntawm cov qauv tshuaj rau cov tshuaj ntsuam xyuas whereas, nyob rau hauv ib qho rov qab titration, peb ntxiv ntau tshaj ntawm cov qauv kev daws teeb meem rau cov tshuaj ntsuam xyuas..
Titrations yog cov txheej txheem peb feem ntau siv hauv analytical chemistry los txiav txim seb tus nqi ntawm cov tshuaj ntsuam xyuas tam sim no hauv cov qauv. Cov analytes xws li acids, bases, oxidants, reductants, thiab hlau ions.
Titration yog dab tsi?
Nyob rau hauv ib qho titration, paub tshuaj tshuaj tiv thaiv tshwm sim. Ntawm no, ib qho tshuaj ntsuam xyuas ua haujlwm nrog tus qauv reagent, uas peb hu ua "titrant". Peb yuav tsum siv cov txheej txheem zoo tshaj plaws hauv titrations, thiab nws yuav tsum muaj ntau yam khoom xws li tshuaj lom neeg ruaj khov thiab muaj peev xwm ua kom hnov mob sai thiab ua tiav nrog cov tshuaj ntsuam xyuas.
Qee lub sij hawm peb siv cov txheej txheem kev daws teeb meem, uas yog cov tshuaj ua kom huv thiab ruaj khov, ua cov khoom siv hauv cov txheej txheem titrimetric. Tom qab ntawd, peb tuaj yeem txiav txim siab seb qhov ntau npaum li cas ntawm cov tshuaj ntsuam xyuas yog tias peb tuaj yeem pom qhov ntim lossis qhov loj ntawm titrant uas cuam tshuam nrog cov tshuaj ntsuam xyuas.
Daim duab 01: Cov cuab yeej rau Titration
Nyob rau hauv titration, lub titrant yog nyob rau hauv lub burette, thiab peb ntxiv cov analyte rau lub titration flask siv lub pipette. Cov tshuaj tiv thaiv tshwm sim nyob rau hauv lub khob titration. Nyob rau hauv ib qho kev titration, lub ntsiab lus uas cov tshuaj tiv thaiv ua tiav (lub ntsiab lus ntawm cov tshuaj sib npaug) yog qhov kawg ntawm qhov titration. Peb tuaj yeem ntes qhov kawg-point siv qhov ntsuas uas tuaj yeem hloov nws cov xim ntawm qhov kawg. Los yog lwm yam peb tuaj yeem siv qhov kev hloov pauv hauv cov lus teb rau kev txheeb xyuas qhov kawg; Piv txwv li, muaj peev xwm thiab conductivity.
Muaj qee qhov yuam kev cuam tshuam nrog titration thiab. Qhov sib npaug taw tes hauv ib qho titration yog qhov taw tes ntawm qhov ntxiv titrant yog tshuaj sib npaug tag nrho rau cov tshuaj ntsuam xyuas hauv cov qauv. Txawm li cas los xij, qhov no yog lub ntsiab lus theoretical, thiab peb tsis tuaj yeem ntsuas qhov kev sim no. Peb tsuas tuaj yeem soj ntsuam qhov kawg-point. Qhov zoo tshaj plaws, qhov kawg-point tsis yog raws nraim qhov sib npaug ntawm qhov sib npaug (titration yuam kev), tab sis peb sim txo qhov sib txawv ntawm ob qhov ntau li ntau tau. Tseem tuaj yeem muaj tib neeg yuam kev cuam tshuam nrog txoj kev no. Yog li ntawd, kom txo tau cov no, peb feem ntau yuav tsum tau rov ua ib qho titration tsawg kawg peb zaug. Tom qab ntawd peb tuaj yeem txiav txim siab tus nqi nruab nrab.
Titration rov qab yog dab tsi?
Nyob rau hauv ib qho rov qab-titration, peb ntxiv ntau tshaj ntawm tus qauv titrant rau tus ntsuas. Tom qab ntawd qee tus nqi ntawm tus qauv titrant yuav hnov mob nrog cov tshuaj ntsuam xyuas, thiab qhov tshaj ntawm nws tseem nyob hauv cov qauv. Ntawm no, peb tuaj yeem txiav txim siab qhov seem ntawm tus qauv reagent siv rov qab-titration.
Piv txwv li, tus nqi ntawm phosphate hauv ib qho qauv tuaj yeem txiav txim siab los ntawm txoj kev no. Thaum peb ntxiv cov nyiaj nitrate ntau dhau rau cov qauv phosphate, ob qho tib si yuav hnov mob kom muab nyiaj phosphate khoom. Tom qab ntawd peb tuaj yeem titrate tshaj nyiaj nitrate nrog potassium thiocyanate. Yog li ntawd, tag nrho cov nyiaj ntxiv ntawm nitrate yog sib npaug rau cov nyiaj phosphate ion thiab tus nqi ntawm thiocyanate peb siv rau rov qab-titration.
Qhov txawv ntawm Titration thiab Back Titration yog dab tsi?
Titration yog ib qho kev tshuaj ntsuam xyuas uas peb siv los txiav txim seb tus nqi ntawm cov tshuaj ntsuam xyuas hauv ib qho piv txwv ntau npaum li cas. Txoj kev rov qab titration, ntawm qhov tod tes, yog ib daim ntawv tshaj tawm ntawm cov txheej txheem titration, uas muab cov txiaj ntsig zoo dua thaum kawg. Txawm li cas los xij, qhov sib txawv tseem ceeb ntawm titration thiab rov qab titration yog tias nyob rau hauv ib qho titration, peb feem ntau ntxiv cov tshuaj sib npaug ntawm cov qauv kev daws teeb meem rau cov tshuaj ntsuam xyuas whereas, nyob rau hauv ib qho rov qab titration, peb ntxiv ib qho nyiaj ntau dhau ntawm cov qauv tshuaj rau cov tshuaj ntsuam xyuas.
Tsis tas li ntawd, nyob rau hauv cov qauv ntawm ib txwm titration, tsuas yog ib qho tshuaj tiv thaiv tshwm sim. Txawm li cas los xij, nyob rau hauv ib qho rov qab titration, muaj ob yam tshuaj lom neeg tshwm sim nyob rau hauv tib tus qauv. Yog li ntawd, nyob rau hauv ib txwm titration, peb tsuas xav tau ib tug txheej txheem thaum nyob rau hauv ib tug rov qab titration peb yuav tsum tau ua ob txoj kev titration. Yog li ntawd, qhov no kuj yog qhov sib txawv tseem ceeb ntawm titration thiab rov qab titration.
Summary – Titration vs Back Titration
Titrations yog cov txheej txheem tshuaj ntsuam xyuas tseem ceeb heev. Muaj ntau hom kev tshuaj ntsuam xyuas xws li redox titration, potentiometric titrations, conductometric titration, thiab lwm yam. Back titration yog ib hom zoo li no. Hauv kev titration, peb feem ntau ntxiv cov tshuaj sib npaug ntawm cov qauv kev daws teeb meem rau cov tshuaj ntsuam xyuas whereas, nyob rau hauv ib qho rov qab titration, peb ntxiv ntau npaum li cas ntawm cov qauv kev daws teeb meem rau cov tshuaj ntsuam xyuas. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm titration thiab rov qab titration.
